Corrected error in handling multiple headers with same name.
Merge pull request #18 from hruellan/HeaderDiff

Corrected error in handling multiple headers with same name.
Add --debug flag to stop on first mismatch.
Merge branch 'master' of github.com:http2/compression-test
Fixed a bug w.r.t. looking up data from the LRU and static entries for
delta2

Added a 'done' call so that stats, etc. can be finalized for compressors
which wish such a thing to happen. This was used to print out the final
letter-frequency counts at the end of the run so that the huffman codes
could be optimized.

Regenerated the letter-frequency-counts based on the data checked into
the http_samples repo

Added canonical huffman coding and some (dead) code (which I'll need to
rip out soon) which would aid in decoding speed were the non-naive
decode used.

Added printouts of the instructions and hex of the serialized data,
suitable for using as examples in a specification...
Added a bit more information to the summary lines
Improved the printing of the Huffman tables
Moved a print statement around w.r.t group and stream IDs
Fixed a bug w.r.t. the "-b" option, whereby it would always run HTTP1,
      even when it wasn't baseline, nor specified on -c.
Oops, fixed a stupidism w.r.t the new handling of -b, it now works
properly.
Add README for delta2 with parameters.
Document parameters; add "max_entries"
Correct behaviour when max_entries isn't passed.