Merge pull request opentoonz#212 from skitaoka/test/pr/177

Allow Boost 1.6.0

Merge pull request opentoonz#36 from ArseniyShestakov/fix-cmake-lette…

…rcase

Fix letter case in CMakeLists.txt

Merge pull request opentoonz#32 from opentoonz/add-how-to-build-macosx

Add how to build for OSX