Begin modifying Raven content in the Maven tutorials. Added explanation
for the Raven content.
More Raven editing.
Resolved conflicts that arose due to poor gitting. Merge remote-tracking branch 'origin/wordsmith-maven-tutorials-raven' into wordsmithing-maven-tutorials

Conflicts:
	develop/tutorials/articles/maven/intro.markdown
	develop/tutorials/articles/maven/setting-up-maven.markdown
Edited Maven references in appropriate tutorials.
Changed "next step" URL format.
Merge pull request #954 from rbohl/wordsmith-maven-tutorials

Wordsmith maven tutorials