Added GA tracking code.
Added Google Adsense code.
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
Merge branch 'master' into gh-pages
Read files in chunks to avoid memory limits when download_via_php is enabled. Fixes #2334.
Merge branch 'master' into gh-pages
Added support for X-Sendfile and X-Accel-Redirect headers for file downloads via PHP.
Merge branch 'master' into gh-pages
Handle all 8 orientation modes.
Don't suppress error messages of image functions.
Only create scaled image versions for inline file types.
Transfer filename via Content-Disposition header if files[0] is not a File instance.

This is a workaround for browsers which don't support a filename param
for FormData.append (e.g. Gecko).
Define cross-browser blob slice method as widget method.
Workaround an exception in Gecko when using Blob.prototype.slice as widget property.

The exception thrown was "Illegal operation on WrappedNative prototype
object" and occurs due to the proxying of the jQuery UI widget methods.