Feature: travis deploy

[jamesjwarren]

This PR adds travis deployment. Releases are triggered on pushing a tag.

Issues to resolve:

• version number is not taken from release tag, it is simply bumped so could get out of sync

[coveralls]

Coverage remained the same at 100.0% when pulling 37679d4 on feature/travis-deploy into 660d34c on develop.

[edoparearyee]

you have 2 release tasks in this gruntfile, i think this one would get overwritten

[edoparearyee]

@jamesjwarren if grunt bump only increments the version number, we need to find a solution that allows us to specify version number ideally from the git tag

[jamesjwarren]

grunt bump accepts an absolute version passed to it so we just need to find a way to extract this info from the git tag.

[edoparearyee]

can you pass the tag in the form of a grunt option? something like:
grunt release -v 1.2.3

[coveralls]

Coverage remained the same at 100.0% when pulling 80a6645 on feature/travis-deploy into 660d34c on develop.

[coveralls]

Coverage remained the same at 100.0% when pulling 1edff06 on feature/travis-deploy into 660d34c on develop.

[edoparearyee]

This looks good to me, well done! 👍