Revert "Update README.md"

This reverts commit b47c625b0484c8c8fb46f568501cdb5b647b79e6.
Fixed deprecation warning: has_many :conditions option
has_many rails 3 and 4 compatibility
resolved naming conflict with Doorkeeper::Rails module
Remove Ruby 1.8.7 from travis, add 2.0.0 to README
Merge 'Rails 4 deprecation warning' from 'asoules/master'
Trailing white space and Ruby 1.9 hash syntax
"warning: `*' interpreted as argument prefix"
README update
"warning: `&' interpreted as argument prefix"
"warning: assigned but unused variable - e"
Merge branch 'warnings fixes' from amatsuda/doorkeeper
update url, point it to proper working url
Use a before_filter to find the Application in ApplicationsController

This makes overriding the default authorization much less code.
If you agree, I'll add a test.
Tests rails 4.0.0