Compass rose navigation widget, scrollbars, thread waits for alert.
Merge pull request #1 from tomatrow/master

Spelling corrections
Up and down navigation, verbose alert message, find room with only name.
Shift after alert, simplify connection positioning algorithm.
License info update.
Linux, windows, mac, build script and libraries.
Connect to old room.
InteractionManager; select room by click.
Paint by floor instead of connecting rooms.
Connection extends Shape.
Update README.md
Room selection works correctly.
Implement Connection.contains, moved point calculation to Connection.
Typo
Switch to full canvas instead of grid.
Select Connections by click with tolerance of 10.
Update .gitignore.
Move rooms with drag.
Use clipping with drawing rooms.
Create connections by clicking. Very messing, should be reorganized.