changed categories and tags url, and added default value

Conflicts:
	templates/includes/sidebar.html
changed categories and tags url, and added default value

Conflicts:
	templates/includes/sidebar.html
Merge branch 'sidebarurl' of github.com:ingwinlu/pelican-bootstrap3 into sidebarurl

Conflicts:
	templates/includes/sidebar.html
added *_SAVE_AS = False case
Merge branch 'sidebarurl'

Conflicts:
	templates/includes/sidebar.html