Complete commit 57dbe3e01a8b4b03eaba705032cf6c6f42b06f12
Fix issue #1104 - regression issue with %%name%% variable

My fingers are itching to rewrite this whole function as it seems to be causing more and more issues. Will do when I have the time, which unfortunately probably won't be all that soon.
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into Issue-1104-regression-in-var-replacements
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into Meta-snippet-help
Some plugins add posts with a post_date but without a post_date_gmt. Sitemap now uses post_date if the post_date_gmt is 0.
Merge pull request #1102 from jrfnl/Meta-snippet-help

Complete commit 57dbe3e01a8b4b03eaba705032cf6c6f42b06f12
Merge pull request #1108 from jrfnl/Issue-1104-regression-in-var-replacements

Fix issue #1104 - regression issue with %%name%% variable
Changelog update.
Added support for %%tag%% even if the ID is empty.
Related #1111
Small improvements to the REGEX that strips all remaining not replaced title vars
Merge branch 'pr/1121'
Changelog update.
Version bump to 1.5.3.1
Small read me update
Backing out earlier change, as this breaks the snippet preview.
Changelog update.
Version bump to 1.5.3.2
Reintroduced the 'Strip the category base (usually /category/) from the category URL.' option.
Changelog update.
License Manager update.