Based upon pylibmc, add libffi built package
Add vendor directory to PKG_CONFIG_PATH
Fix bash if syntax
fix mixedup variable/cmd execution syntax
Remove 'vendor' dir reference that doesn't exist in tarball
Match target directory to libffi.pc's hard-coded path
Add libffi lib path to runtime LD_LIBRARY_PATH
changing git URL
Merge pull request #1 from ehrlichja/master

changing git URL
change libffi binary url
ld_lib_path
remove lib_path
detect cryptography package
Fix merge conflict
Add test for libffi