Merge pull request #94 from VarunAgw/permissions

Add support for controlling access to threads based on user permissions.
Updated plupload to newer version and finished frontend part
Placing wp_localize_script() inside if condition

It was accidentaly placed outside in commit
6600cda004c142a7eda8d3eeee1955f7df50427a
Created an UI to to allow user to set E-Mail notification settings
Implemented a combo box to override E-Mail notification settings of a thread
Allow retrieval of notification setting of all users at once
Allow retrieving only tag/E-Mail account for which user get notifications
Send E-Mail reply notifications to only users who subscribed for them
Renamed tag_setting_page() method to notification_setting_page()
Using labels for form elements
Disable checkbox while AJAX request is processed
Adding support for I18n in e-mail notification setting page
Corrected WP coding standards
Added inline comments to method
Created a short describing use of E-Mail notification setting page to end user
Showing labels properly in Details meta box in thread page
Merge pull request #96 from VarunAgw/notifications

Add support for e-mail notifications when new replies are processed.
Updated plupload to newer version and finished frontend part
Using WP time constants to denote time period
Refactored `if` condition