thumbnail support for mediacontent

Jira-issue: WP-1160
Merge pull request #33 from aldafu/WP-1160-android-mediacontent-thumbnail

thumbnail support for mediacontent
Add minimal VLC on Android media-play impl

Starting playback is the only currently supported method.

Jira-issue: WP-1162
Merge pull request #34 from aldafu/WP-1162

Add minimal VLC on Android media-play impl