Update README.md

Fixed typo in README.md, line 327.
Read g.greater_than.. should be q.greater_than
Added contains all query
Add example to array
Document use of advanced targeting for push notifications
Add http_status_code to ParseProtocolError.
add convenience #update_attributes method
add convenience #first method
allow #eq to be passed a hash of multiple key/value pairs (convenience)
Retrieve installation object data
Allow update installation's data
allow `Parse::Model` to accept a data hash in its initializer
implement #array_remove_relation
add #find method to Parse::Model
Merge pull request #145 from Xavdidtheshadow/master

added quiet mode
Merge pull request #147 from Xavdidtheshadow/master

added quiet to readme
Merge pull request #146 from RobotsandRockets/remove-relation

implement #array_remove_relation
Merge pull request #144 from ck3g/installations

Installations
Merge pull request #143 from RobotsandRockets/convenience

Convenience Methods
Merge pull request #141 from kenn/http_status_code_in_error

Add http_status_code to ParseProtocolError.
Merge pull request #138 from dukedave/patch-2

#137 Document use of advanced targeting for push notifications