TIMOB-4749 and TIMOB-14180 Android Camera: Support autohide and hideCamera.

See testing notes in [TIMOB-4749](https://jira.appcelerator.org/browse/TIMOB-4749?focusedCommentId=261180&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-261180), but remember to resolve [TIMOB-14180](https://jira.appcelerator.org/browse/TIMOB-14180) as well if tests succeed.

Note: I only have one handset to test on (Galaxy Nexus, Android 4.2.2), so be sure to test a few.