Added CONTRIBUTING.md
Updates to CONTRIBUTING.md
Other updates to CONTRIBUTING.md
Updated Contributing section in README.md
Set DNT via the prefs service

Closes #91
Merge pull request #69 from mrshu/contributing

Added CONTRIBUTING.md
Start using Disconnect's services
Merge pull request #106 from EFForg/fix/dnt-headers

Set DNT via the prefs service
Merge branch 'master' into feature/private-browsing
Remove xhr dependence, test privateBrowsing init
Add cleanup for private browsing
Rewrite userStorage methods to respect private browsing
Remove unused setCookieFrequency map
Add separate originFrequency store for private sessions
Check private browsing mode in determining disabled sites
Refactor, remove private browsing context in userRed/Yellow/Green

For now, don't keep private stores for userRed/Yellow/Green in private
browsing mode because the cookie permissions manager is not aware of
private browsing anyway.
Remove Disconnect services, fix naming bug
Fix style nit
Handle case when originFrequency[origin] is undefined
Add tests for private browsing storage