AliInst: Homebrew par before everything else
AliInst: gfortran for Yosemite

With many thanks to http://coudert.name/!
AliInst: install CMake on OS X with Homebrew
AliInst: link to the CMake website
AliInst: Homebrew: upgrade + fix Yosemite issue
AliInst: fixed link to manual installation
AliInst: add Yosemite to the supported platforms
Post: announce ALICE Yosemite support
Merge branch 'feature-aliyosemite'