Double-check all used on the static vs blog home options

Searched for 'show_on_front', 'page_for_posts', 'page_on_front'
Fix double separator showing in snippet preview

Last bit from issue #1321
Stricter custom replacement variable names

* Allow uppercase letters and dash in custom replace variables (js)
* Restrict custom variables name to [A-Za-z0-9_-] characters
Fix issue 1333 - slashes in snippet preview
Fix issue #1343 - re-introduction of bug blocking Soliloquy
whitespace *sigh*
Updated changelog
Add phplinting for two versions of PHP
Fix issue #1340 - Redirect loop on search

Fixed redirect loop which occurred on multi-word search or when search query contained special characters and the 'redirect ugly URL's' option was on.
I seem to have been a bit too zealous trying to escape unsafe $_SERVER variables before ;-)
Fix issue 1368 - error notice on multisite new blog creation
Prevent the issue re-occurring
add __DIR__ in require function
add retrocompatibility thanks to dirname(__FILE__)
Open Graph Meta tags: automatically disable Jetpack's OG tags

This avoids duplicate sets of tags
Make the lint run on lowest and highest tested php versions
Limit linting to php files and run lint in parallel sessions for speed
Let's try that again with a colon at the end
fi
Let's run the phpcs selectively as well then
Update the environments

- The WP.org git repo does not have minor version branches, only major versions
- The WP.org git repo master is currently 4.0-beta3, so we should test v 3.9(.4) separately