Merge pull request #193 from sebv/master

Doc update
Merge pull request #194 from sebv/master

Added mocha example and doc
Merge pull request #196 from sebv/master

Package update + test coverage
Merge pull request #197 from sebv/master

Adding missing coverage files
Update README.md
example fix
Merge branch 'master' of github.com:admc/wd
Merge branch 'master' of github.com:sebv/wd into chai_as_promised_4