Updated project to better support Android Studio

[ankurkotwal]

• Migrated to Android Studio project structure
• Updated Google Play Services dependency to google-play-services-maps:8.4.0
• Removed reference to support library
• Removed references to Eclipse from README

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[jfschmakeit]

This section doesn't look right for Android Studio. in the default 'Android' view, the manifest is under 'Application -> manifests'

[markmcd]

Is this line still true?

(originally I meant this in terms of the "instrumentation" tab, but it looks like you've added a custom XML file with the key, so I think this whole block needs an update)

[ankurkotwal]

@markmcd @jfschmakeit Have addressed all code review comments. PTAL.

[markmcd]

Merge at will