Created skeleton files for Bugzilla online plugin

The skeleton files based on offline version of plugin.
Added Apache XML-RPC client libraries, created Bugzilla client skeleton and XML-RPC client which handle cookies. Added username and password fields to configuration dialog.
Added license informations
Added comments for clarification and replaced concrete parameter type with interface

Replaced HashMap with Map
Extracted method which add cookies to request
Removed absolute path to the sources of the library Apache XML-RPC
Added BugzillaOnlineXmlRpcClient integration tests
Added license and author informations
Merge branch 'bugzilla_online_plugin_feature' into dev
Corrected files encoding

Changed from Cp1250 to UTF-8 for better support for the Polish characters
Removed client and client adapter interfaces

The solution will be specific and bonded to one client
Created authentication tab and moved username and password fields into it
Added information about the university
Replaced BugzillaOnlineClientException with the XmlRpcException
Throw exception further

KNIME will log him by itself
Merge branch 'bugzilla_online_plugin_feature' into dev
Merge pull request #111 from mnegacz/dev

Dev
DEP-9 data source plugin removed
Merge pull request #112 from majchmar/master

DEP-9 data source plugin removed
DEP-9 removed tests