Merge pull request #261 from bvssvni/master

Updated docs
Merge pull request #262 from bvssvni/master

Moved drag_controller to its own repo
Merge pull request #264 from bvssvni/master

Added SetShouldClose and SetSize
Merge pull request #266 from bvssvni/master

Added property types to window module
Merge pull request #268 from bvssvni/master

Separated CaptureCursor from Window trait
Merge pull request #270 from bvssvni/master

Replaced `close` on Window trait with `Set<ShouldClose>`
Merge pull request #272 from bvssvni/master

Separated `Get<DrawSize>` from Window trait
Made `GetTitle` and `SetTitle` part of Window trait

Closes https://github.com/PistonDevelopers/event/issues/274