wordpress importer: fallback onto wp:post_id if wp:post_name is empty
Python-Markdown quote's URL's, we need to unquote to use on filesystem

Fixes #1143
Closes #1095
Closes #1149
Minor wording changes in develop_server.sh
Fixing a typo in documentation
Merge pull request #1186 from mhrivnak/patch-1

Fix a typo in documentation
Merge pull request #879 from joeshaw/post-id

Wordpress import error on empty <wp:post_name>
Fix #1182#
Merge pull request #1190 from w-vi/quickstart-fix1182

Fix for issue #1182
add a signal on article writing
Use the actively maintained typogrify-web package

The Typogrify library is no longer actively maintained by the
original author. These changes switch Pelican over to a new fork that
will receive more consistent updates going forward.
Update Travis config with new Typogrify package
Merge pull request #1215 from justinmayer/typogrify

Use the actively maintained typogrify-web package
Merge pull request #1214 from hrbonz/article_generator_write_article

Add a signal on article writing
Change CATEGORIES_URL and CATEGORIES_SAVE_AS docs to
make it consistent with TAGS_URL and TAGS_SAVE_AS.

Add default values to CATEGORIES_URL and CATEGORIES_SAVE_AS.
Merge pull request #1219 from iurisilvio/categories_url

Set CATEGORIES_URL and CATEGORIES_SAVE_AS
pep8 fixes
Simplify a bit pagination code.
More pep8 fixes and refactor the check for old settings.
Clarify docs about the DIRECT_TEMPLATES _SAVE_AS and _URL settings.
Merge pull request #1220 from saimn/misc

Clarify docs about the DIRECT_TEMPLATES _SAVE_AS and _URL settings.