Codespeed

* NEW: Frank refactored the Django project and app. Now Codespeed is a proper, installable Django app, and there is a sample project in the "example" dir
* NEW: Upgraded to jQuery 1.6
* NEW 44: Stefan added an option to the timeline view for equidistant data point plotting
* NEW: Permalinks are now id based for Environment, to shorten the length and avoid problems related to url encoding, as well as to allow changing the name without beaking the permalink
* FIX: Frank added a check for revision_date = "None" (as string), caused by the
save_single_result.py sample script

* NEW: Settings option to select the default benchmark in the timeline view
* NEW: Added save_multiple_results, an example script that saves data using JSON
* NEW 45: Stefan Marr added support for browser-button navigation on timeline
* FIX: Stefan Marr improved the GitHub plugin
* FIX: Improvements in the Changes View layout that prevent overlapping in some cases
* FIX: Stefan Marr fixed a bug where links to a changes view revision from the
timeline view would not work because they used short commit ids
* FIX: Stefan Marr prevented some infinite loops caused when results were equal or less than 0

This release involved big refactorings. The addition of branches, particularly, changes the DB schema, so that old DBs will need to be migrated. See instructions of how to migrate in the Wiki pages.

Major features:
* acdha added support for git and github
* Danilo implemented branches. A revision is now always associated to a branch, and different branches can be compared in the Comparison view
* Server Logging
* David Fraser added new documetation explaining the Codespeed views and concepts

Major features:
* New home page with result Reports: show summary of latest benchmark runs
* RSS feed showing Reports
* Support for Netbooks, tablets, and smartphones screen sizes through the use of media query
* Big performance improvements in the Changes and Timeline views
* Added settings for change and trend thresholds and default comparison executables
* Mercurial support

Bug Fix release

* Changes view:
- Render a different results table for each unit type.
Finally fixes color coding of benchmark results which have different "lessisbetter" values
- Display min/max columns if data present
- Display only significant digits (automatically calculated precision)
- Small CSS touches

Bug fix release

* General:
- Repare 404 and 500 pages
* Changes view:
- Fix units column and less is better checking in the changes table
- Stop loading commit logs when URL does not respond
Timeline view:
- Fix timeline grid bug triggered when benchmarks names present with special characters (reported by joe)
- Don't display grid option when only one benchmark present
* Comparison view:
- Fix several small bugs
- Make chart defaults configurable in settings (whished by joe)
- Change in style when there are lots of benchmarks: no bar padding.
- Fix benchmark/legend ordering
- Improve error messages
- Issue correctness warning for normalized stacked bars.

* Known bugs:
- There are several bugs in the comparison view related to the plotting library jqplot
- Bad autoscaling under some circumstancies. Issue199 (http://bitbucket.org/cleonello/jqplot/issue/199/autoscale-breaks-negative-values)
- infinite loop in some cases, notably when there are no result values for some benchmarks. Issue200 (http://bitbucket.org/cleonello/jqplot/issue/200/autoscale-error)