[Fix] Updated 'tinymce' partial as 'file_browser_callback' has been replaced with 'file_picker_callback' as per TinyMCE version 4.2.1
[Fix] Updated 'tinymce' partial as 'file_browser_callback' has been replaced with 'file_picker_callback' as per TinyMCE version 4.2.1

Signed-off-by: Kevin Sanderson <67c6f6b46484749cd701c02defb8a2a3f3d74065@gmail.com>

jeremykenedy/laravel-5-simple-cms,kravn/CMSProject,liuliwork/laravel-5-simple-cms,denise92/laravel-5-simple-cms,kravn/TTG-CMS,SaifulAzam/laravel-5-simple-cms,Gerardo-junior/laravel-5-simple-cms,denise92/laravel-5-simple-cms,jeremykenedy/laravel-5-simple-cms,Gerardo-junior/laravel-5-simple-cms,denise92/laravel-5-simple-cms,faozimipa/laravel-5-simple-cms,kravn/CMSProject,SaifulAzam/laravel-5-simple-cms,liuliwork/laravel-5-simple-cms,faozimipa/laravel-5-simple-cms,kravn/TTG-CMS