Fixes #66, remove border from empty table cells
Fixes #67, Remove url string from ContestUrlCell
Update README with better notes/spacing/newlines
Remove HEAD from xctool

The HEAD commit apparently added a breaking change for our combination
of xcode/ios simulator/xctool on the travis stack.
This reverts xctool to use the current stable version (0.1.14) at
time of this commit, which works.
Merge branch 'feature/sprint-4-cleanup' into develop