Add .travis.yml

Related to #3
To integrate with Travis CI
Add requirements.txt

Otherwise Travis breaks
Removed install requirements

Related to Issue #3
So travis CI passes and pull request can be merged
Improved .travis.yml and test.ini
Improved .travis.yml
Merging from travis_integration to master
Merge pull request #5 from OpenDevelopmentMekong/travis_integration

Merged Travis integration