SWS-104 Adds travis testing

[josejulio]

Following React docs [1]

[1] https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#travis-ci

[josejulio]

Testing on my own fork yields the following error/warnings/notes that might need further review:

• Failed to load tsconfig.json: Missing baseUrl in compilerOptions
• Found no baseUrl in tsconfig.json, not applying tsconfig-paths-webpack-plugin
• The project was built assuming it is hosted at /mtho11/swsui/.
  You can control this with the homepage field in your package.json.

[mtho11]

I fixed the last issue with #26
The first two issues don't stop the compiling and can be addressed as a separate PR.

[josejulio]

I closed/opened this to kindly let travis know that he should run the tests.

[mtho11]

LGTM. The minor compile warning can be fixed later.