Better test for builds
Added functions to load/dump YAML-based job configuration
Improvements to job execution context object
Removed zombie lines
Added pyyaml dependency
New interface for the job state storage
Partial implementation of the new postgresql-based storage
New object to hold / manipulate (nested) build progress reports
Initial commit of documentation
More docs
Big refactoring of storage component
Logger handler now calling log_message() w/o passing job_id
[#14] Fixed New configuration serialization [tests green]
Big refactoring:

- fix #14: now accepting configuration (in YAML) from file
- jobs definition is now on file, *not* in the "storage"
  (which is now used only for builds state)
- fix #9: definition of call arguments is now done in the YAML configuration
- #7 is now possible in the new database model
- #6 still work in progress (progress disabled for the moment)
- #4 is not needed anymore (no more edit forms)
- what about #3? (we still have build run/delete forms to protect..)

Tests still need to be ported before we can think of merging this.
Removed old templates
More improvements to UI
[#9] Added support for passing return values as arguments
Improvements to serialization
Some new tests for storages
More tests for new storages