Contextual help for Type attribute

Added tooltip help for the type attribute explaining the purpose of this field
Added missing attributes
Specified order for fields
Fixed URLs

Replaced hardcoded URLs with link_to
Added default scope for PGNs

And also corrected relationship
Added nested fields as permitted attributes
Layout for PGN Index

Initial styling for PGN list including tooltips for verified/unverified status
Added markdown support
Add thin as app server and cocoon for nested forms
Remove turbolinks
Rewrite parameters when editing pgns to autolayout fields
Add formatted values and default scope
Update default sort
Use formatted values
Pretty up field detail
Some style for PGN pages
DB updates
Form partial for fields in PGNs
Updates to test fixtures