Rebase to master/0.2
Test commit
NColor add. EditBox add(not tested). EmpireMap window improved. PictureConverter::fill improved.
Garden have no speed penalty more.
Merge branch 'master' of https://github.com/gecube/opencaesar3

Conflicts:
	INSTALL_LINUX : resolved using gecube/master
	README.md : resolved using gecube/master
Merge pull request #119 from dalerank/master

Overlay add