Organize/fix project descriptor and fix small Javadoc errors.

Fix pom.xml to have consistent plugin layouts; add new JXR plugin for linking code information into other plugins.
Fix data provider names/Javadocs for OAuthConsumerDataNGTest classes.
Add deployment related plugins to project descriptor.

Add/fix plugin documentation to be more clear and concise.
Add git ignore for Github .nojekyll file.
Add automatic Github release generation, git tag generation, and maven site upload to gh-pages branch as part of maven release/deploy.
Add new artifactory plugin repository.
Rename project from JCloud to JNimbus,

All instances of JCloud are now replaced with JNimbus because of an accidental similarity to another open-source library name.