UI fixes
- added expandable commits messages
- ui fixes, icons/graph

revert default to 20, for large repositories it's better to go less and have it faster.
This is still saved in user session so everyone can set high number and have it saved while logged in.

api review
- normalized parameters (repo_name, group_name)
- added return values to some create functions
- fixed docs
- fixed bugs of parameters mismatch on docs

fixes #333 mismatch of argument for get_repo API method
- a little code garden

added warning on sqlite when using migration.
Sqlite prior to 3.7 series are known to not support some
migration changes like table renames. Thus are failing.

backported fixes for issue #318
- session cleanup for mercurial and git middlewares

fixed problem with anchor links that contains non ascii chars
- anchor links are now based on md5 of path and not path safe web representation

- fixed issue with mark all read button for notifications and listeners on delete buttons
- hide mark all read if notification inbox is empty

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

- fixed issue with missing commits on some repos commands
- fixed issue with parsing commits for stats when there were only two commits

implements #329
- api function for adding a users_group into repo
- fixed found issues on API with missing params detection
- updated docs for api

code garden
- added more logging to auth ldap
- updated keywords for setuptools

bumped up beaker version
code garden

implements #308 rewrote diffs to enable displaying full diff on each file
- fixed escaping of html special chars in file editor

code garden for changeset ranges and comments
- disabled (for now) comments on changeset ranges
- code reuse by mako namespaces
- added flag for enabling comments in diffs

Added sorting into journal and admin pages
- code garden to reuse some blocks and make it consistent on different views

fixes #229 repo sorting is not working.
- implemented repo sorting using YUI dataTable

implements #307, configurable diffs
- global context increase and whitespace
- perfile context and whitespace
- fixed anchor links support

- diff.css merge to main style.css
- css fixes for diffs
- JS fixes for diff and inline comments

default session settings was reverted to file.
- encrypted cookie requires additional libs, might be confusing for new users
- others who need it still will enabled it

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