refactor template according tornado template engine
refactor use and link process
add multilines support
refactor custom tag definition, and reimplement role and permission tag
create empty environment
modify pygettext so that it can compatible with new style
add --comment to manage.py for find -t
make import_attr error more user friendly
add defined function
change debug for template support
add _vars to namespace
improve
Merge branch 'dev' of github.com:limodou/uliweb
Merge branch 'dev' of github.com:limodou/uliweb
Merge branch 'master' into dev

Conflicts:
	uliweb/contrib/rbac/tags.py
Merge branch 'master' into dev
merge master
Fix _compat.py, fix orm get_connection() bug
Fix get_connection bug
Refactore SimpleFrame middle wares process
Merge branch 'master' into dev
Fix middleware process bug
Fix template bug
Not show warning about embed template tag
Fix template bugs
Add staticize command