point licensing submodule to 'master' branch
multisite licenses changes, move logic to license manager on a per-plugin basis
Merge pull request #1015 from dannyvankooten/feature/network-licenses

multisite licenses changes, move logic to license manager on a per-plugi...
License Manager update.
Bumped version to 1.5.2.7.
Added PHPDocs to test methods, cleaned up class tests, added WPSEO_Rewrite tests.
Merge branch 'master' of github.com:Yoast/wordpress-seo
Increased tested up to version.
Updated el_GR, hu_HU, nl_NL and pl_PL
Updated readme - change log i18n