Updated doc string
Fixed exception:

--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 134, in maybeDeferred
    result = f(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/core.py", line 1128, in getobjectlist
    gui, _window_name=self._get_window_handle(window_name, True)
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/utils.py", line 825, in _get_window_handle
    gui, name = self._internal_get_window_handle(window_name)
  File "/usr/local/lib/python2.7/dist-packages/ldtpd/utils.py", line 866, in _internal_get_window_handle
    w_name = name = u'%s%s' % (obj_name[0], tmp_name)
exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 27: ordinal not in range(128)

Thanks tuxskar filing bug https://github.com/ldtp/ldtp2/issues/2
Updated doc string with appropriate arguments as per LDTPv2
Added optional argument based APIs
Removed verifyselectrow API
Updated selectrow arguments
Updated selectrow argument
Merge pull request #5 from ldtp/master

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