Synchronise with the most recent version

All files have been backporting from the published extensions.
Trailing spaces

Saving bandwidth one byte at a time.
Extension converted to Tumblr APIv2

All the XHR of the concerned extensions have been rewritten to use the
APIv2.

Fix https://github.com/atesh/XKit/issues/161, except for the Timezone
fetching of the Profiler extension, which does not exist anymore in the
APIv2.
Fixing a typo in read_more_now.js

There was a wrong reference to timestamps.apiKey instead of the
read_more_now.apiKey
Merge pull request #163 from WyohKnott/apiv2-fix

Pull Request to fix issue 161