added backendless implementation
added account info for backendless
updated backendless SDK, plus some jshinting and fixes ain backendless/script.js
fixes
added Backendless to list of implementations
fixed bugs in backendless implementation
a few more changes for backendless
removed necesity for base invoice class changes
Delete backendless-invoice-app.zip
Merge pull request #10 from Backendless/backendless

Changes in/for the Backendless implementation for the Backendless example