add unitest for md5File()
merge upstream
Put build folder to gitignore
Fix OS X 10.9 compiling issues
Merge pull request #14 from dlackty/build-gitignore

Put build folder to gitignore
Merge pull request #15 from dlackty/fix-osx-compiling

Fix OS X 10.9 compiling issues
Tweak main CMakeLists
Merge pull request #16 from dlackty/tweak-cmake

Tweak main CMakeLists
Merge pull request #17 from aholic/dev

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