This should be superseded by a proper rewrite of the media manager code

This avoids treating double slashes as single line comments in CSS when
they are used in a filter or content string.

closes #638

the second include was never removed, causing an endless loop.

Web path was used instead of filesystem one.

source maps are invalid for our dispatched sources and may even cause
problems. this makes sure any sourcemap declarations are stripped from
the output

for backwards compatibility

double slashes in url() always have to be ignored

Yes, it's hiding $auth, but detail templates might depend on that. We
need to fix this properly.

This reverts commit 343aa174.

The regex wasn't properly escaped here which lead to problems when the
path contains backslashes. This is the root cause of the bug reported
at https://github.com/cosmocode/edittable/issues/19

In most cases this change will have no effect, but noes the response will use the filename that was originally requested. The downloaded filename can be modified to something different as well. E.g. the siteexport plugin will make use of it.

changed variable name $create_time to $modified_time

http://english.stackexchange.com/questions/117552/why-does-information-not-have-a-plural-form

locations corrected, when those values are "url(...)".

Explanation:  In the change to the less css extension, variable
replacements now happen after the less/css files are processed
for correction of relative locations.

This reverts commit 88833bac.
and fixes FS#2874