sketch a data reader/writer architecture for acts
added intermediate level for imported acts
added logging information to import infrastructure
specified the 'import' logger for data_import infrastructure
bugfix in import
added __str__ and __unicode__ methods for Person class
added __str__ and __unicode__ for Charge in data_import
bugfix
Merge remote-tracking branch 'origin/dev' into import-refactor
refined data import for acts.

fixed emitting institution and initiative reading/writing
update schema definition for import/export
added models for data import of acts
added code for writing om objects from intermediate representation
print traceback on IntegrityError exception

there is a not-very-clear exception (IntegrityError) raised when
calling the save() method, due to the mis-configuration of
transitions data (that should be omitted, at the moment, btw).
imported support type for acts

detect whether a charge support an imported act as first_signer or as
co_signer
added support for importing the documents attached to an act
act presentation transition added only if presentation_date spec

if no presentation_date is specified during act creation,
don't try to add the presentation transition for the act itself

bugfix: during importation, get...create pattern for act
importation replaced with get_or_create
use through Model to keep track of Calendar extra info
added django-tinymce req
Merge branch 'dev' into import-refactor

Conflicts:
	open_municipio/acts/models.py
	requirements/main.txt