Added bower requirements to the Mac OSX build instructions.
Fixed spelling errors in paver docstrings and code comments.
Removed duplicate Edit Layer button from layer view.
Merge pull request #976 from garnertb/small_doc_fixes

Small documentation fixes.
Added "Edit Features" link back to the Edit Layers button.
Merge pull request #977 from garnertb/template_fixes

Removed duplicate Edit Layer button from layer view.