Merge github.com:web2py/web2py
allow navbar without define_tables, thanks Anthony
routes_in = (regex, value, custom_env)
routes_in = [('/welcome','/welcome',dict(web2py_disable_session = True))]
conditional session connect only
fixed backward compatibility issue in dal with __int__, thanks Dominic
speed optimization in custom_import.py by using local namespace
CACHED_REGEXES_MAX_SIZE, thanks Anthony
executesql allows fields and/or colnames to be independently specfied, thanks Ahtony and Niphlod
faster custom_import, thanks Michele
fixed error in admin login
updated markmin docs
fixed input-xlarge class issue, thanks Anthony
minor changes in web2py.css
executesql(fetch=False)
try fetchall except, back in executesql, thanks Carlos
fixed update with compute fields (again) and ecomponents in markmin
prevent exception in admin, thanks Marin
fixed problem with headers in components
fixed issue 976 with quoting in pg8000