Chore: update dependencies

- sinon -> 1.12.1 unit & integration test pass
- dox: removed unit & integration test pass
- semver: -> 4.1.0: unit & integration test pass
- qs -> 2.3.3: unit & integration test pass
- opener -> 1.4.0: unit & integration test pass
- tar removed: unit & integration test pass
- grunt-contrib-less -> 0.12.0: unit & integration test pass
Docs: Add rebase instructions for maintainers
Chore: npm version and link to docs

- added a badge to display npm version
- remove temporary link to the docs