Merge pull request #1 from simonwheatley/feature/composer-json

Adds `composer.json`.
Update composer.json
Merge branch 'master' of github.com:johnbillion/ExtendedCPTs
Update composer.json
Create README.md
Update plugin header
Update composer.json
Create LICENSE
Update README.md
Update README.md
Update README.md
Update README.md
Readme update
Update the bulk post update messages code for WP 3.7
2.3.1
Update the 'Right Now' code to support the new 'At a Glance' widget in WordPress 3.8
A little more abstraction when generating column titles
More efficient detection of the current request's post type
Update the 'At a Glance' code for WordPress 3.8.1
Some more inline docs