Note that Chassis requires local-config.php
Clarify that content/themes/ needs to be created

Also removes local-config.php instructions, as newer Chassis versions don't
require it.
Merge pull request #114 from WP-API/clarify-testing-config-instructions

Fix testing instructions with Chassis
Fix link to issue tracker

We've been using GitHub for a while now.
Merge pull request #125 from WP-API/fix-issues-link

Why all the issues on GitHub if you're using GSOC's Trac?
Move filter registration out of CPT constructor
Merge pull request #126 from WP-API/deduplicate-filters

Move filter registration out of CPT constructor
Add call to register_filters in documentation

Missed in #126.
Update to 0.9