Added getter for cell contents to CGridColumn

Added getters to CGridColumn to allow getting cell contents
for extended use cases of CGridView.

issue #106
Issue #2653: updated Markdown Extra Lib to version 1.3
Ability to substitute model attribute name, to use custom data getter. It is not dangerous to use any custom fields and getters, because it will work for read-only.
fix #2378 CActiveRecord::tableName() in namespaced model
removed occasional FormInput file
cache dir creation with correct file mod
added options to set mode (used by mkdir and chmod)  for cache directory and files
changed formatting
added tests for CFileCache cacheFileMode and cachePathMode
added CHANGELOG line
Add html5 form elements
Resolve merge conflicts
resolve merge conflicts
Merge branch '2738-ActiveRecord.tableName' of https://github.com/velosipedist/yii into velosipedist-2738-ActiveRecord.tableName

* '2738-ActiveRecord.tableName' of https://github.com/velosipedist/yii:
  removed occasional FormInput file
  fix #2378 CActiveRecord::tableName() in namespaced model
  Ability to substitute model attribute name, to use custom data getter. It is not dangerous to use any custom fields and getters, because it will work for read-only.
better fix for #2378
fixed test break for php < 5.3.0
Merge branch 'fix-cache-dir-permissions' of https://github.com/ujovlado/yii into ujovlado-fix-cache-dir-permissions

* 'fix-cache-dir-permissions' of https://github.com/ujovlado/yii:
  added CHANGELOG line
  added tests for CFileCache cacheFileMode and cachePathMode
  changed formatting
  added options to set mode (used by mkdir and chmod)  for cache directory and files
  cache dir creation with correct file mod

Conflicts:
	CHANGELOG
Merge branch 'master' into 106-cgridcolumn-extend

* master: (741 commits)
  fixed test break for php < 5.3.0
  better fix for #2378
  CHANGELOG line for #2777
  guide fix about autoloading
  Re-added call to Yii::autoload to import() to keep speed
  Replaced explicit call to Yii::autoload() with call to autoloader stack
  fixed CApplication docs about autoloader
  fixed formatting, adjusted changelog
  Changing from "ob_end_flush" to "ob_end_clean"
  Changelog update
  Code formatting
  Handle thrown exception in widgets when 'captureOutput' is set to true.
  [UK][Guide] typos  [ci skip]
  Issue #2654 has been added to CHANGELOG
  CDbCommand::buildQuery() no longer throw exception if 'from' is missing.
  Unnecessary comment at CErrorHandler::render() has been removed.
  Chapter 'Using 3rd-Party Autoloaders' has been added to guide
  CErrorHandler::errorAction via AJAX has been added to UPGRADE
  Issue #2753 has been added to CHANGELOG
  CErrorHandler has been refactored to respect errorAction on AJAX request.
  ...

Conflicts:
	CHANGELOG
better fix for #106 according to discussion in #2052
adjusted the default Grid column classes to changes made in #2052

use get...Content() instead of render...Content()