Instructions for creating an OS X native development environment

Probably not 100% complete yet, but covers enough to pass all specs.

NOTE: requires either libXML2 2.7.6 or the separately submitted fix to
pretty_text_spec.rb
The wrong version actually got moved to this branch when I tried to clean some things up. This version should be correct :-)
Update client.zh_CN.yml

1,Add tag
2,Fix translation
Store base URI in Discourse.BaseUri and use it in all places where rootURL was previously used
Use temp variable for .chosen().next()
fix some typos in cs translation
Fix styling of category select when editing a topic title
Use a font-awesome icon in category search field instead of the default hideous one
Give magic wands to all moderators
Underline links in the detected problems messages on admin dashboard
Fix for when category description has html. Could be better.
Work in Progress: Content Editing in Admin Section
add max-width to all img in onebox-result-body
consistent behavior regarding file uploads
get regular trust level going, self heal inconsistent topic timings
Merge pull request #654 from ZogStriP/consistent-behavior-regarding-file-uploads

consistent behavior regarding file uploads
Merge pull request #653 from kubabrecka/cs_typos

fix some typos in cs translation
Merge pull request #647 from windyson2008/patch-1

Update client.zh_CN.yml
Merge pull request #637 from wojciechka/master

Putting rootURL in JavaScript using Discourse::base_uri and erb
trust ranges are 0-4, not 0-5 (moderators diff)