Guard against empty list-items in base.tmpl

If the license/search_form are blank, don't show a list-item for them.
Fix spelling of 'prevlink'
Add Tim Chase to AUTHORS.txt
set sites in template engines

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
fix #1038 -- make Jinja filters configurable

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Merge branch 'clean_base' of https://github.com/Gumnos/nikola into lists

Conflicts:
	CHANGES.txt
	nikola/data/themes/base/templates/index_helper.tmpl
	nikola/data/themes/base/templates/post_helper.tmpl
Add issue #.
More guards.
make the filters work with mako, too

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Fix for a part of #1032
merged master
Update literal.
Merge branch 'master' into lists-ramiro
add trailing backslashes for wordpress imported BASE_URLs

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Resolve #1041 differently because it was getting too quirky

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
add the mathjax tag for WordPress import

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
fix url mapping and tests

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
remove overfull whitespace

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Merge pull request #1042 from getnikola/sitemap_once

Fix for a part of #1032
fix conflict