Use uname command to detect Darwin platform
Add travis-ci script
Merge pull request #680 from Chilledheart/detect_darwin_correctly

Use uname command to detect Darwin platform
Merge pull request #689 from Chilledheart/travis-ci

Add travis-ci script
travis-ci: build vala file seperately to avoid bus error
Merge pull request #690 from Chilledheart/travis-ci

travis-ci: build vala file seperately to avoid bus error