Checked in code for registering a user to Mongo

Also the gson code in the DAO's for reading and writing to the database
Merge branch 'master' of https://github.com/griffindj/umw_330.git

Conflicts:
	trunk/twitterAlt/pom.xml
	trunk/twitterAlt/src/main/java/edu/umw/cpsc/twitterAlt/view/HttpServer.java