Initial creation of models that will store data, metadata and comments
First draft of models
First draft of admin
Enable admin interface
Merge branch 'vulnerability-db' into socioeconomic-db
Use Region and Country tables from the vulnerability db
Use explicit CountryIndicator table to collect values for each couple country-indicator
Substitute Tag1to6 tables with Keyword table; define what fields are not mandatory; set join table unique_together fields
Remove old_code (useless); pluralize field named keyword into keywords
Add zones table with a many-to-many relationship with countries, to allow user-defined zones
Assign explicit name to country_indicators table to use the same convention of Django many-to-many relationships
Models defined to store project data and metadata, with corresponding comments
Merge branch 'svir-project-definition' into socioeconomic-db

Conflicts:
	openquakeplatform/openquakeplatform/svir/models.py
Change CharField into TextField where necessary. Add Project and Comment to admin interface
Rename Comment fields user==>created_by and created==>created_on
Merge branch 'master' into socioeconomic-db
Add possibility to create a new project, upload project definition and first draft of uploading project data
Some renaming and additional comments
Add world app
Use countries from external db