Early attempts at testing RBLResixableImage
Fix dem tests
Add tests to verify the correct asset it used

@2x versus @1x
Add RBLTableView.

This aims to fix the scrolling craziness that can occur when holding
down arrow keys in NSTableView.

This matches the behaviour of the likes of Mail.app.
Merge from master
Merge remote-tracking branch 'origin/master' into rblresizableimage-tests
Tests improvements and possible fix for #79
Remove the -writeToFile:
Add assertions to check we have the blue border
Make the RBLTableView header public.
Import the RBLTableView header in the catch-all header.
++specta
Merge pull request #80 from github/rbltableview

Add RBLTableView.
Fixes responder chain with RBLViewController
Merge pull request #82 from sirenum/master

Fixes responder chain
Define a property to dictate whether the popover can be key
Implement the key property.
Merge pull request #83 from github/key-popover

Choose whether a popover can become key
Merge pull request #81 from github/rblresizableimage-tests

Fix RBLResizableImage to use @1x representation for @1x contexts
Verify that font descriptors exist before cascading to them

Fixes a crash where the text renderer would look for a glyph in one of
the font descriptors from the cascade list, but the font was
nonexistent.