Allow to perfrom search of words entered with Cyrillic letters(probably ...

...will work with other national alphabets too).

Checked with Kodi 2:14.0~git20141208.0500-c489922-0trusty/plugin.video.bromix.youtube.alpha28

The Cyrillic string passed to plugin as str containing utf-8 and stored in search history as unicode utf-8. Added branching to process str/unicode differently and avoid exception on ascii conversion of str containing utf-8.

Disclaimer: i have almost 0 expertise in python programming and xbmc/xbmc addons code and realize 
that proposed fix might be an example of cargo cult coding

Original exceptions after entering Cyrillic string and fixing exceptions places one by one. 
1.

0:02:09 T:140396373964544   ERROR: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<--
                                             - NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!
                                            Error Type: <type 'exceptions.UnicodeDecodeError'>
                                            Error Contents: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)
                                            Traceback (most recent call last):
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/default.py", line 7, in <module>
                                                runner.run(__provider__)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/runner.py", line 16, in run
                                                __RUNNER__.run(provider, context)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/impl/xbmc/xbmc_runner.py", line 21, in run
                                                results = provider.navigate(context)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/abstract_provider.py", line 59, in navigate
                                                result = method(context, re_match)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/abstract_provider.py", line 215, in _internal_search
                                                search_history.update(text)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/utils/search_history.py", line 42, in update
                                                self._set(self._make_id(search_text), search_text)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/utils/search_history.py", line 34, in _make_id
                                                m.update(search_text.encode('utf-8'))
                                            UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)
                                            -->End of Python script error report<--
2.<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

01:03:59 T:140397192378112   ERROR: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<--
                                             - NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!
                                            Error Type: <type 'exceptions.UnicodeDecodeError'>
                                            Error Contents: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)
                                            Traceback (most recent call last):
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/default.py", line 7, in <module>
                                                runner.run(__provider__)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/runner.py", line 16, in run
                                                __RUNNER__.run(provider, context)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/impl/xbmc/xbmc_runner.py", line 21, in run
                                                results = provider.navigate(context)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/abstract_provider.py", line 59, in navigate
                                                result = method(context, re_match)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/abstract_provider.py", line 222, in _internal_search
                                                new_context = context.clone(new_path=new_path, new_params=new_params)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/impl/xbmc/xbmc_context.py", line 130, in clone
                                                plugin_id=self._plugin_id, override=False)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/impl/xbmc/xbmc_context.py", line 18, in __init__
                                                AbstractContext.__init__(self, path, params, plugin_name, plugin_id)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/impl/abstract_context.py", line 30, in __init__
                                                self._uri = self.create_uri(self._path, self._params)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/impl/abstract_context.py", line 102, in create_uri
                                                uri_params[param] = unicode(params[param]).encode('utf-8')
                                            UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)
                                            -->End of Python script error report<--
3.<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

01:13:44 T:140396424320768   ERROR: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<--
                                             - NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!
                                            Error Type: <type 'exceptions.UnicodeDecodeError'>
                                            Error Contents: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)
                                            Traceback (most recent call last):
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/default.py", line 7, in <module>
                                                runner.run(__provider__)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/runner.py", line 16, in run
                                                __RUNNER__.run(provider, context)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/impl/xbmc/xbmc_runner.py", line 21, in run
                                                results = provider.navigate(context)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/abstract_provider.py", line 59, in navigate
                                                result = method(context, re_match)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/abstract_provider.py", line 249, in _internal_search
                                                search_history_item = items.create_search_history_item(context, search)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/items/utils.py", line 15, in create_search_history_item
                                                image=context.create_resource_path('media/search.png'))
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/items/directory_item.py", line 6, in __init__
                                                BaseItem.__init__(self, name, uri, image, fanart)
                                              File "/home/xbmc/.kodi/addons/plugin.video.bromix.youtube/resources/lib/kodion/items/base_item.py", line 11, in __init__
                                                self._name = unicode(name)
                                            UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)
                                            -->End of Python script error report<--