Fix OS X build
Merge branch 'master' of https://github.com/BlueBrain/DisplayCluster
Merge pull request #94 from flavioberetti/master

Finish porting to Arch and Gentoo
Fix build with gcc 4.4
Fix build with gcc 4.4
Merge pull request #95 from eile/master

Fix build with gcc 4.4
Fix RHEL6 release build
Merge branch 'master' of https://github.com/eile/DisplayCluster

Conflicts:
	src/core/CMakeLists.txt
Merge branch 'master' of https://github.com/BlueBrain/DisplayCluster
Merge pull request #96 from eile/master

Build fixes
Use master branch of Eyescale/CMake in .gitexternals again