Merge pull request #12 from samzhao88/develop

clean up files and add comments
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Update README.md
reorganize the code
Merge branch 'develop' of https://github.com/FlightFinder/FlightFinder into develop
reorganize the code
Update README.md
added types and labels
Update README.md
Update README.md
Update README.md
Update README.md
Merge pull request #14 from HaoranHuang/develop

Reorganized code structure
added Henry Engine
Merge pull request #15 from HaoranHuang/develop

added Henry Engine
fixed started time bug
fixed started time bug
Merge pull request #16 from HaoranHuang/develop

fixed started time bug
Update README.md