Cleanup

Make sure all properties are explicitly synthesized,
remove unneeded semicolons, add ARC specifiers to suppress
warnings.

Also build script can now be called from any directory.
Small fixes

Do not perform unnecessary height calculations when layoutSuviews
is going to take over anyway... Replace ellipsis with a proper character.

Build script: drop “project” from path options and add “derivedData”. Use
OS-level check for absolute paths.
Preliminary support for content sources other than Twitter and Livefyre
Merge pull request #22 from Livefyre/rc2

Add content source types, update CLI build script