Begin to create image plugin for Bootstrap
Add ImagePlugin.php and ImagePluginTest.php as empty
Add tests to ImagePluginTest.php

This is the tests contain like that:

- Call ImagePlugin as inline method

- Call ImagePlugin as convert method

- Parse params when call as inline method

- Parse params when call as convert method
Implements ImagePlugin.

Add inline method and convert method and some functions.
and now, all tests green.
Add description for convert plugin
Add tests that image path is not 1st param.

If you write `&image(rounded,class=custom,URL,alt-text)`,
3rd param should be set for image path.
Modify how to check params in parseParams function.

Change foreach statement in parseParams() to check only type and custom class.
Then check params for setting path and alt text.
Add tests that lack pattern params order & too many params
Add tests that multi custom class accept
Fix preg_match for custom class parameters
Add tests that "left" or "right" param for convert plugin
Add accept params "left" and "right" for image floating
Merge pull request #25 from toiee/feature-image-plugin

Create image plugin for Bootstrap