Revert "Merge branch 'feature' of https://github.com/mybb/mybb into feature"

This reverts commit 8fcfb00f6e02e4bb9fea2eaf27c8d51a4c91e674, reversing
changes made to 1e7b8bc088879072b5d6b56256c4b572273986e7.
Revert "Revert "Merge branch 'feature' of https://github.com/mybb/mybb into feature""

This reverts commit 1c4e7a67f4bcc4df397d82e54d72195fcf4dee0f.
Tidying up commits.
Updating theme to use CDN URLs.
Fixed other uses of script URLs to ensure the use of CDN URLs.
Merge branch 'feature' of https://github.com/mybb/mybb into feature
Working CDN compatibility for images.
Removing referential assignment of $mybb->asset_url.
Merge pull request #64 from euantorano/feature

Adding settings for CDN compatibility.