Imported some of the GPLv3'd changes from RhodeCode v2.2.5.

This imports changes between changesets 21af6c4eab3d and 6177597791c2 in
RhodeCode's original repository, including only changes to Python files and HTML.

RhodeCode clearly licensed its changes to these files under GPLv3
in their /LICENSE file, which states the following:
The Python code and integrated HTML are licensed under the GPLv3 license.

(See:
https://code.rhodecode.com/rhodecode/files/v2.2.5/LICENSE
or
http://web.archive.org/web/20140512193334/https://code.rhodecode.com/rhodecode/files/f3b123159901f15426d18e3dc395e8369f70ebe0/LICENSE
for an online copy of that LICENSE file)

Conservancy reviewed these changes and confirmed that they can be licensed as
a whole to the Kallithea project under GPLv3-only.

While some of the contents committed herein are clearly licensed
GPLv3-or-later, on the whole we must assume the are GPLv3-only, since the
statement above from RhodeCode indicates that they intend GPLv3-only as their
license, per GPLv3§14 and other relevant sections of GPLv3.

Reimplemented file-browser using partial-ajax
- improves the speed of browsing of files for revision
- url push state via html5 History
- also cache the results of calls for even faster handling the content

Added h.tooltip to all places that tooltip_title is used.
- improved escaping of < and > inside tooltips

Implements subrepos view inside filebrowser
- fixes issue #434: Error when accessing files or changesets of a git repository with submodules

fixed vcs issue with last_changeset for filenodes
- fixed incosistency for displaying revision in file browser
- fixed raw_diff for git for single file mode
- file block now uses associated changeset for both git&hg

implements #330 api method for listing nodes at particular revision
- improved filtering by files in file list

Implements #304
hashes in relevant places are displayed using monospaced font.

fixes issue #320.
- added mapping of commit users into rhodecode users

new files views
- compated space
- nicer gui
- code garden

cleaned up JS files in files templates.
- fixed some small issues with editing/adding git files using codemirror
- small css fixes
- separated files/dir browsing into separate template

replaced all decode('utf-8') instances with .decode('utf-8','replace') for more error prof setup,
this way rhodecode could handle displaying non utf8 encoded file paths. This is still an invalid path, but this way we could at least show those paths without errors

reimplemented tooltip, refactored tooltip_title into title for proper html,
and changed display strategy to right to temporary fix display problem with large tooltips

Fixed url bug when using numeric revision in file browser,
added follow branch checkbox for browsing only changesets from current branch

fixes few bugs
- fixed #53 python2.5 incompatible enumerate calls
- fixed #52 disable mercurial extension for web
- fixed #51 deleting repositories don't delete it's dependent objects
- small css updated

fixed deletion of repository on filesystem, works based on scm type for git and hg.
agged 'ago' into age function
some css fixes

some changes for #45.
Added warning messages for browsing wrong cs/paths
Cleanup of codes

fixed nasty bug when browsing on renames.
Turned off dirsize until new vcs release.
some templating updates