Merge pull request #169 from elgreco84/master

Fixed method for getting video thumbnails
Adding the conversation recipient model object and client.
Merge branch 'master' into conversationRecipientsPagination

Conflicts:
	CanvasKit.xcodeproj/project.pbxproj
Merge pull request #170 from benkraus/conversationRecipientsPagination

Adding the conversation recipient model object and client.
Fixing incorrect path for submissions.
Merge pull request #171 from benkraus/submissionPathFix

Fixing incorrect path for submissions.
updated podspec for new version
More groups support
Merge remote-tracking branch 'upstream/master'