Add Link and Form Helpers

Lots added, not yet, complete, though. 

I ported some of the form and link items from the old Compound docs. The I18N stuff might need a review, though.

A thought: should Forms get it's own page? Seems like it requires enough documentation for its own section.
Finished 'All Together Form' and added "select".

All Together Form is complete, and added notes on select. Might need a second-look and spot check. I can add the JS and CSS stuff, maybe custom helpers, but I will leave Content Tags for someone that knows more about them.
Fixed some markdown syntax errors.

Minor markdown syntax changes.
Merge pull request #13 from dlochrie/patch-1

Started some work on Helpers