updated api-access token
updated URL expiration time
Added documentation on MongoDB

Also, updated details of handling multiple branches and code samples to
include app name parametrization.
Merge pull request #59 from anowak/heroku-mongodb

Added documentation on MongoDB
Merge pull request #58 from vidyar/api-token-branch

updated api-access token
updated sample_node
updated sample_ruby
updated config.rst
updated sample_python
updated sample_java
updated sample_php
updated sample_scala
updated sample_ruby_neo4j
updated sample_ruby_cassandra
updated notifications
updated config.rst
updated cassandra.rst
Merge pull request #60 from vidyar/samples_branch

Updated code samples