Merge branch 'master' into insert
made sure that the date is updated when an object is updated
Merge branch 'master' into cursor
new properties of the Cursor
* split cursor.rules into cursor.rules and cursor_properties.rules
* limit as option in poly_db
Merge branch 'update' into cursor

Conflicts:
	apps/common/rules/cursor.rules
now objects from the database have a name (their _id)
Merge branch 'master' into cursor
DatabaseCursor now has properties SORT_BY and SKIP
Merge branch 'cursor'
categories in documentation
Merge branch 'cursor'
removed (unfinished) function poly_db_ids from branch master
improved category documentation
improved documentation
function poly_db_ids
Merge branch 'cursor'

Conflicts:
	apps/common/rules/db.rules
new functions get_db_info, set_db_info, set_col_info to retrieve information about available databases and collections
new function get_db_list that returns an array of available databases and collections
Merge branch 'cursor'