Update README.md
expose redirect url setter to OAuthActivity
cleanup
Merge pull request #27 from box/exposeredirecturl

Exposeredirecturl
Update HelloWorldApplication.java
force hide oauth view if user doesn't want to show redirect url
Merge pull request #28 from box/sample

force hide oauth view if user doesn't want to show redirect url
Adds group support.
Merge pull request #29 from box/BoxGroup

Adds group support.
Merge branch 'master' into support-v4_latest
Updated BoxJavaLibraryV2 jar to 12/9 build (7e4d603).