Add initial develop version of gasform

A port of fuelphp/fieldset to PHP < 5.4
Update ElementContainer to support population with data
Add Gasform\Fieldset as a ElementContainer
Update Gasform\Input_Submit to extends Gasform\Input_Button
Update Gasform\Form to support rendering nested ElementContainers
Update Gasform\Render_Simple to render nested ElementContainer properly
Add Gasform\Input_ButtonGroup
Add support for Selects with options and optgroups

Also fix some bug in Input_CheckboxGroup that would create unpopulated entries after running populate
Fix some bugs and add Gasform\Input_Optgroup
Add Gasform\Render_Bootstrap
Add copyright "2010 - 2013 Fuel Development Team" to all files
Fix bug in Gasform\Input_RadioGroup resulting from short array syntax
Update all classes and fix non set attribute 'type'
Add meta container to Gasform\Element
Update Gasform\ElementContainer with disable_fields(), set_errors(), and meta container
Add Gasform\Input_Hidden
Fix non PHP 5.3 array notation in Gasform\Input_CheckboxGroup
Add Gasform\Input_Hidden to bootstrap.php
Update Gasform\Render_Bootstrap to support errors, meta, and Input_Hidden
Add Bitdeli badge to README.md