Updating README.md

Adding Travis build status
Removing Node 0.8
Merge pull request #13 from mozilla/travis

Removing Node 0.8
Fixing `Usage` typo
Fixing commented-out issuing method for real
Badge issuing fixes
Adding update application function
Merge branch 'issuing-fix' into application-updates

Conflicts:
	lib/modelUtils.js
Fixing merge error
Fixing merge error again