Prep for 1.3.0 (#352)

Expanded Travis CI Tests (Curl/Non-Curl)

Updated parse-php-sdk to version 1.2.9

Bumped version to 1.2.8

Adds methods to ParsePushStatus to handle checking the current status…

… of a recent push request.

Modifies http_build_request to always use '&' to combine query args with

Helper for twitter auth added and general login/linkers added for fut…

…ure 3rd party auth

Updated to 1.2.4 for bi-directional fix

Update ParseQuery.php

Updated to 1.2.2 with improved tests for ParseServer