Bigbluebutton-api

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small fixes in Type Comparison

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urllib2 replaced by requests
pre upload of slides by URL added
further attribute for recording

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extended and refactored meeting_info to get all 0.8 attributes
API calls for recordings added

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Meeting_Setup: logout_url parameter changed from None to ''.
This points to the default url given in the config of bigbluebutton.

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Meeting_Setup: logout_url, max_participants, duration and welcome parameter added
Meeting: end_meeting_url added

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minor bug fix