Create an automated deployment step in the travis build

[ray-millward-tessella]

Description:
The travis build should include a step at the end of a successful build that deploys a version of the code back to GitHub (GitHub Releases) - this should only run against the master branch and the resulting package name should include the version number.

Acceptance criteria:

• There is a github release step at the end of the travis build that deploys the built artifacts back to GitHub.
• The release step only runs against changes to master (i.e. after pull requests are merged in)
• The resulting package should include the version number