Add CI System

[Furchin]

Likely either CircleCI or TravisCI, we'd like to run the unit tests as part of PR validation, and upon merge to master. The build should fail if:

• Any of the unit tests fail.
• The code coverage drops below what the last merge to master produced

The build should not fail if:

• The code coverage drops below the coverage provided by some other branch which has not yet been merged to master.

This issue depends on #6 being completed (otherwise it's pointless)!

[anishkny]

IIUC, Coveralls should be able to cover these requirements, and has good integration with CircleCI/Travis CI. Would that work?

[Furchin]

Yup good point although I got Codecov.io working first as #17! Coverage reports should be being published to https://codecov.io/gh/builtforme/CodeBnb now. I added #18 #19 #20 #21 to help bolster the unit tests and the resulting code coverage. Resolving this issue.