Merge branch develop of github.com:/EllisLab/CodeIgniter into session

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+###############
+Language Helper
+###############
+
+The Language Helper file contains functions that assist in working with
+language files.
+
+.. contents:: Page Contents
+
+Loading this Helper
+===================
+
+This helper is loaded using the following code
+
+::
+
+	$this->load->helper('language');
+
+The following functions are available:
+
+lang('language line', 'element id')
+===================================
+
+This function returns a line of text from a loaded language file with
+simplified syntax that may be more desirable for view files than calling
+`$this->lang->line()`. The optional second parameter will also output a
+form label for you. Example
+
+::
+
+	echo lang('language_key', 'form_item_id');
+	// becomes <label for="form_item_id">language_key</label>
+