Added Pinq

PHP Integrated query, a real Linq library for PHP.
Update README.md

Added Drest under the Rest and API section. More details on this tool can be found here: http://leedavis81.github.io/drest/
Added Yii2 framework
Added AspectMock library
Adds PHPTAL as templating library.
Add Zxcvbn-php

Add @bjeavons' Zxcvbn-php library
Add print_o
Tweak contribution guidelines.
Fixed naming of Opauth.
Merge pull request #201 from uzyn/patch-1

Fixed naming of Opauth.
Add new book.
Added PHPCheckstyle
Add Zephir
Add CssToInlineStyles to Email section

Added https://github.com/tijsverkoyen/CssToInlineStyles, useful for inlining CSS so it works in more email clients.
Move Plum to the correct section
Merge pull request #218 from ThePixelDeveloper/patch-1

Move Plum to the correct section
Merge pull request #208 from wapmorgan/add-zephir

Add Zephir
Updated Propel's description.
Update README.md
added known list of IDEs