Fixing our default HTTP Accept header to be spec-compliant.

See bug http://code.google.com/p/android/issues/detail?id=5843

Also fixing a bug in the test webserver, where we weren't formatting
the headers properly. I'm dumbfounded how the tests passed previously;
although I fear that omitting the @TestTargetNew annotation might mean
that they weren't being run. I'll investigate that in a follow up.
3 files changed