Adds support for catching responses with content type image/tiff.
Adds support for catching responses with content type image/tiff.

By intercepting the response headers and analysing them we can determin if a
response is a tiff, regardless of the URL. When a tiff response is detected the
extension redirects to the PNG dataurl version and sets a new content type
header to force the browser to open the image inline.

my-codeworks/chrome-tiff-viewer,my-codeworks/chrome-tiff-viewer