Fix old digest attribute

Attribute is now integrity
Merge pull request #62 from josh/fix-old-attribute

Change use of old digest attribute with integrity attribute
homepage - canonical version is in W3C CVS, checked in here for comments and PRs
ugly hack for iOS expanding iframe
keep touchfix div bigger on bigger screens
workaround chrome iOS XHR+CSP bug
Admin: Cleaning up trailing whitespace.
Admin: \t -> \s\s\s\s.
Admin: Cleanup.
MIX: Drop "JavaScript Global Environment".

Fetch has redefined `client` as an environment settings object. This
patch rewrites the various MIX definitions in light of that change,
leaning on that object's browsing context and its related attributes
rather than finding the context from the environment.