Complete commit 57dbe3e01a8b4b03eaba705032cf6c6f42b06f12
Added check if cat_name is set when replacing title variables so %%category%% get's properly replaced on category archive pages.
Fixes #1106.
Merge branch 'master' of github.com:Yoast/wordpress-seo
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 pull request #1101 from dannyvankooten/master

Various code styling error fixes.
Hide PHP_CodeSniffer warnings in Travis.
Add Slack notification
Fix Travis - Slack integration
Encrypt Slack token.
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
Added first basic wpseo_replace_vars test.
Replace the %%strings%% always
Optimized preg_replace in replace vars
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