Fix broken collision code
Got SDL2 update building, but it is completely untested beyond that.
Fixed some threading issues (did Go's threading model change?), and got Images and rect drawing working.
Got images and viewports working.
Moved util package contents to root starfish package.
Fixed text drawing.
Added a core event thread to backend.
Fixed more threading issues. The main thread now sets up the window and runs the main event loop.
Renamed backend package to plumbing.
Merge branch 'master' of https://github.com/mboeh/starfish into devel
Put mboeh in AUTHORS file since I pulled a change from him.
Kind of got mouse wheel working.
Replaced SDL_PollEvent with SDL_WaitEvent.
Disabled logging by default.
Got rid of old import paths.
Added better installation instructions.

Conflicts:
	util/Makefile
Ran go fmt.
Removed relative imports.
Updated example and changed default window title.
Merge branch 'devel' of github.com:gtalent/starfish into devel