Added v0.9.2 screenshots.
Merge remote-tracking branch 'origin/master'
Removed unused drawables, renamed used ones.

The 'rating' icons are now prefixed with `ic_`.
Fixed margin of speaker icon in talk list items.

Got messed up in the transition to dimen values for margins.
Use a little gradient in special list item backgrounds.
Use gradient background for talk details header.
Feature packages.

You get a feature package! You get a feature package! EVERYONE GETS A FEATURE PACKAGE!
Created view group for speaker details.

Simplifies the TalkDetailsFragment logic a little bit.
Removed "speakers" header in talk details view.

Saves a little vertical space.
Added loading indicator to talk details activity.
Added loading indicator to talk list.
Fixed talk list item size issues.

 Some devices displayed incorrect item height. Fixed by setting both the layout_height and minHeight attributes.
Updated Parse SDK to 1.5.0.
Removed unused "speaker" string resources.

Not used after update of SpeakerDetailsView.
Version bump for release 0.9.3.