Merge pull request #20 from dz1111/UnitTestingAdditions

Linked frameworks in testing targets; added singleton test to logic tests
Show license selector/viewer, currently hardcoded to CC-BY-SA 3.0

Note this will show CC-BY-SA 3.0 for all uploaded images, regardless
of the actual license template selected. This needs more work. ;)
There's also no actual selector, just a space for one which when
clicked opens the license text from the web.
Add .gitignore with various files that should be excluded
reorg table view to be larger
Switch from TableView to CollectionView

This currently breaks iOS 5 compatibility, but there's a drop-in
replacement which we should be able to use.

Thumbnails are currently kinda ugly as we sized them for the 64x64 square
but need bigger images now.

Cells are 300x200 on iPhone (1 col) and 240x200 on iPad (3 or 4 cols).
Convert to fetch larger thumbs on demand

Fetching larger thumbs via API on demand, using the default URL cache (in theory).
Thumb URLs are saved at refresh or upload time.
Only refresh thumbnail when changed