Private content view class to dramatically speed up window resizing.
Coding style fixes.

Signed-off-by: Max Seelemann <max@the-soulmen.com>
Fixed setting an invalid frame when initially adding content views.
Swapping out content views removes previously set custom content view class.
Merge pull request #125 from macguru/master

Private content view class to speed up window resizing.
Style
Fix implicit value conversion.
Merge pull request #127 from rastersize/floorf-to-floor

Fix implicit value conversion.
Update podspec thanks to @vtourraine
Fix default position of document icon and versions divider and button.
Add backward compatibility to Mac OS 10.6
Added mouse drag detection threshold.

This considerably reduces CPU load while dragging container view.

Note that the threshold is only used when drag occurs on title container view, but even restructured code as it is, results in much smoother operation for most frequent cases where underlying window intercepts the drag.
Disabled window buttons now respect their style when window is not focused
Merge pull request #132 from tomaz/master

Added mouse drag detection threshold.
Merge pull request #130 from yjiq150/master

Add backward compatibility to Mac OS 10.6
Use constants to specify the title bar widget offsets.
Add a comment explaining the values of the offset constants.
Merge pull request #129 from jakepetroules/patch-1

Fix default position of document icon and versions divider and button.
Spaces -> tabs and reindent
Update .gitignore