Add .rvmrc to .gitignore but supply a sample file

* ignoring .rvmrc so people can feel to use their own and not
  accidentally commit it
* added a .rvmrc.sample file for people to get started
* fixes #608
* [ci skip]
Update Discourse to Ember 1.0 RC2
remove useless console.log
XSS fix for category descriptions
Fix issue with duplicate slugs
users can now cancel image upload
Include uncategorized pinned topics on 'Hot'
Much faster development mode reloading.
No idea why these tests weren't failing for me in guard when I pushed last time. Fixed!
improve Email Deliverability Test email
oops, left out a word
Show a Please Upgrade message to people on unsupported browsers
let's make the "script/generate-pseudolocalization.rb" a rake task
cs translation update - client.cs.yml correct pluralization
increase max_mentions to 10
Remove weird characters from browser-update.js
Convert all Ajax calls to use Discourse.ajax()
add fast blank
fast blank to latest
debug assets for debugging assets ... set to 1 in my .rvmrc