Fix #4940

Before this fix, the URL wasn't updated in IE8 when navigating into
folders.

This fix makes use of the hash part of URLs to make this work in IE8,
since IE8 doesn't support the history API nor changing the URL without
redirecting.

From now, both the regular query URL "?dir=somedir" and "#?dir=somedir"
will work in both IE8 and non-IE8 browsers.

In IE8, query based URLs are automatically converted to hash URLs upon
page load. The conversion is done on the server side by redirecting the
user to the updated URL.

When loading a page directly using a hash URL in the form
"#?dir=somedir" in IE8, the server doesn't get the hash, so it will not
return any results in that case and rely on ajax to load the first page.

Frontend:
- The files app list now uses ajax calls to refresh the list.
- Added support the browser back button (history API).
- Added mask + spinner while loading file list

Backend:
- Added utility function in core JS for parsing query strings.
- Moved file list + breadcrumb template data code to helper
  functions
- Fixed some file paths in trashbin app to be similar to the files app

This reverts commit 64d09452.

fix size of icons in 'new' dropdown menu - I hope @jancborchardt knows a better solution coz this won't work in most IE versions ...

revert changes to fbbc76f2 because master is very unstable right now

Before the click on a single file delete icon fired two different handlers - one of them is for multiple deletion only

New id defined for files table for positioning.

fixes #2001 - in case the user has no permissions to upload/create files/folders a clear warning is displayed

I couldn't get Chromium and FF to agree, so a working hack
is better than a non-working one ;)

The notification div has been moved to the user templates.
Correct display of the notification will only work with the use of OC.Notification.show() as on fadeIn() the css needs to be changed as this style required display: inline.