The user should not have to step over it

Default groups

Reviewed-By: Jared Hancock <jared@osticket.com>

thread: Always embed HTML in email templates

Reviewed-By: Peter Rotich <peter@osticket.com>

thread: Detect inline and separate attachments

Reviewed-By: Peter Rotich <peter@osticket.com>

html: Remove duplicate style properties

Reviewed-By: Peter Rotich <peter@osticket.com>

pjax: Fix confusing POST resubmit

Reviewed-By: Peter Rotich <peter@osticket.com>

If an agent submits a page via a POST (like updating settings in the admin
panel or creating a ticket) and navigates away via PJAX, if the browser
refresh button were clicked sometime later, the browser would prompt the
user to resubmit the POST data.

This patch avoids the issue by setting the browser's current URL to itself,
which magically clears the POST data.

The proper fix for the issue would be with
[Post/Redirect/Get](http://en.wikipedia.org/wiki/Post/Redirect/Get) method,
which would redirect the browser to a page it could GET after a successful
POST. Therefore a subsequent GET would reload the GET request, not the POST.
However, that would be too much of an edit for now.

References:
http://stackoverflow.com/a/6077822/1025836
http://en.wikipedia.org/wiki/Post/Redirect/Get

Also use single quotes instead of double quotes in style attributes which
do not require escaping to "

This is necessary to avoid the confusion caused by group names like
"Managers" and "Staff".

If an email contains both inline and separate attachments, the previous
logic would detect all the attachments as inline.

Separate attachments have the `cid` set to `false`. This will pass the
`isset` test, which would cause the logic to search through the body for a
string of `cid:`, which would very likely be found if there was another
inline image somewhere in the body of the email.

content: Update content_id after creating new content

Reviewed-By: Peter Rotich <peter@osticket.com>

css: Fix datepicker and redactor overlay

Reviewed-By: Peter Rotich <peter@osticket.com>

pjax: Various issues

Reviewed-By: Peter Rotich <peter@osticket.com>