Avoid duplicate content in sitemaps.

Respect the STRIP_INDEXES option.

Resolves issue #836.
Document resolution to #836.
Test if path ends with index_file, not *is* index_file.
Removed priority from sitemap.

Resolves issue #838.
avoid rest warnings about duplicate targets
Merge branch 'master' of github.com:getnikola/nikola
Merge pull request #839 from Aeyoun/remove-priority-from-sitemap

Removed priority from sitemap.
solved conflict
fix #835 — meaningful deploy errors

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
move a parenthesis

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
make yapsy be quiet
flake8
shut up yapsy
Revert "make yapsy be quiet"

This reverts commit 596581a29fd37b87ac59cc0818160e4b1be96c93.
This seems to make yapsy be quiet and doesn't hide syntax errors in plugins
This seems to make yapsy be quiet and doesn't hide syntax errors in plugins
missing impor
flake8; fix #841 (the actual errors are to be handled somewhere else)

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Fix tests
Include XML in GZIP_EXTENSIONS (for RSS, sitemap)

Resolves #844