Merge pull request #16 from seesiva/master

Updating README.md
Update README.md
Update README.md
showing fb image or gravator image

migration for user name
fixes #18 now word list are open to everyone without login
added dotenv to handle the environment issues during development with the help of .env.development file
This file can be used as a simple replacement to database.yml during the development process.
Merge branch 'master' of https://github.com/seesiva/corpus