Edited docs on implicit components and finite difference.
Merge pull request #1564 from pziegfeld/Jan_docs_review

Edited docs on implicit components and finite difference.
Adding a file in GUI enables commit.
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into bug
Merge pull request #1565 from setowns1/bug

Adding a file enables commit
Merge branch 'dev' into gui