[IRE-11] added link to take the user back to the blog homepage from the categories page.
Merge remote-tracking branch 'upstream/master'
[IRE-13] updated CKEditor to 4.3 so that the image2 plugin could be used, allowing content writers to horizontally center images, among other things
Merge pull request #4 from djhype/master

Commit for tickets IRE-11 and IRE-13