[#59498072] Prefer Ruby1.8 if compiled against sdk 10.8 or earlier
Merge branch 'develop' into 59498072-Ruby1.8-On-OS10.9

Conflicts:
	CMakeLists.txt
Merge pull request #654 from NREL/59498072-Ruby1.8-On-OS10.9

[#59498072] Prefer Ruby1.8 if compiled against sdk 10.8 or earlier