Don't show another prompt after quit
Start proper erltrek shell, with command history and tab completion.
Fix bugged quad move event on fail to move.
Merge remote-tracking branch 'upstream/master' into kaos

Conflicts:
	src/erltrek_terminal.erl
Merge pull request #10 from kaos/kaos

Merge @kaos changes of new erktrek_shell module
Auto-expand command (except quit) (#5).

Commands can now be abbreviated so you don't need to expand simple commands,
speeding up the input process.
Fix bug in tab expansion when using abbreviated command (#5).
Add phaser command to shell. (#5)
Merge pull request #11 from kaos/kaos

* Add/fix more code on erltrek_shell modules of auto-expand and phaser command