Fix for keyword density when special char in focus keyword

When special characters are in focus keyword (ä,ö,ü etc.) it doesn't calculate the keyword density correctly (always 0%)
Fix output of author for Google+

When the front page is set to static and a page or post, the author is displayed even when it is set to not display.

The first check should be if it's the home page. Both is_home and is_front_page need to be used. is_home doesn't return true when the front page is static and set to a post.

The next step is to check if the option plus-author is set and it's doesn't have the value of -1, which is the value given when you select not to show an author on the home page.

Signed-off-by: Peter van der Does <github@avirtualhome.com>
Fixes #54 - ampersand (&) in sitetitle in Title Templates loading as &amp;
Enhancement: Improved breadcrumbs and titles for 404 pages
Merge pull request #73 from jrfnl/404breadcrumbtitle

Enhancement: Improved breadcrumbs and titles for 404 pages, props @jrfnl
Use .xsl for XSLT files, remove the video sitemap as it doesn't belong in this repository.
Various bug fixes, props @jrfnl
Merge pull request #64 from petervanderdoes/feature/fix-google-plus-author-output

Fix output of author for Google+ when using a static front page, props @petervanderdoes
Merge pull request #63 from siriuzwhite/master

Keyword density calculation not working when special character in focus keyword, props @siriuzwhite.
Reverse output buffer cleaning for XML sitemaps, as that collides with WP Super Cache, thanks to [Rarst](https://github.com/Rarst) for finding this. Fixes #24
Fix canonical and rel=prev / rel=next links for paginated home pages using index.php links, fixes #67
Fix og:title bug mentioned here: http://wordpress.org/support/topic/meta-property-ogtitle
When remove replytocom is checked in the permalink settings, these are now also redirected out. Fixes #68
Code cleanup
Add filters to OpenGraph output functions lacking them.
Changelog update and version bump.