CRAFTERCMS-565: Upgrades TinyMCE to version 3.5.10

Custom CStudio files/folders:

* plugins/cs_contextmenu
* plugins/cs_inlinepopups
* plugins/cs_table
* themes/advanced/skins/cstudio-rte/

* themes/advanced/js/link.js
* themes/advanced/anchor.htm
* themes/advanced/readme.txt
* themes/advanced/editor_template.js
Checks if keyboardNav exists in the color picker before destroying it
Changes polling interval for session timeout
Merge pull request #166 from quiaro/2.3.x

Upgrades TinyMCE to version 3.5.10 and changes polling interval for session timeout