Do not change master branch unless you REALLY know what U R doing!

Revert "Added '-game' launch option"

This reverts commit 2891c2ea4ce2e7c844d1e93db71dcfa8ad2ca100.
Colobot Gold 0.1.1-alpha
Fixed version codename (-alpha)
Colobot Gold 0.1.2-alpha
Corrected markdown formatting in INSTALL
Release 0.1.3-alpha
Post-release 0.1.3-alpha