Use setFrame: instead of setSize: to set size

setSize: has obnoxious failures
Dispatch reflow calls.
Add icon gimp file
Restrict libextobjc to the things we use
Regenerate app icons so they don't look chopped up on retina displays
Mark screens as needing reflow when they get a space identifier

Closes #153
Don't try to manage full screen spaces

Closes #103
Further reduce the use of libextobjc
Bump version for release 0.8.5 (8)
Add Widescreen Tall layout to README
Update version link on README
Add a short Contributing section to the README

Closes #156
Add a link to a screencast to README

Closes #53
Disable fullscreen detection for now.

Closes #159
Update README to add a Contact section

Closes #157
Bump version for fix release 0.8.5.1 (9)
Update to 0.8.5.1 in README
Fix a bug that would incorrectly cycle between space identifiers

This was causing some flickering under certain rare circumstances because Dock
owned windows would be identified as being on the wrong space.

Closes #166
Fix up sundry project details
Always use the largest possible size for a window.

Closes #168