added reference to auth development to documentation
(a) Fix CORS issue: add 'Content-Type' and 'Accept' to allowed headers, (b) Fix missing dependency for test
Adding license file
Linking to Auth development in adding-auth branch
Added link to auth impl notes in README.md
Update README.md
Merging changes from adding-auth branch into master
Handling elasticsearch issue #33: https://github.com/elasticsearch/elasticsearch-js/issues/33