Add nghttp2 HPACK compatibility layer.
Import the compatibility layer now.
Add a Travis install file for nghttp2.
Best to cd to the right place.
Add NGHTTP2 tests to .travis.yml.
It's important to get permissions right.
We need GCC 4.8.
libstdc++ seems to cause problems.
Add upstream repo for G++4.8
BY THE POWER OF ROOTSKULL
Install nghttp2 to the virtualenv.
Add test for incorrect nghttp2 install.
Keyerror when skipping tests is bad.
Try exporting LD_LIBRARY_PATH.
Attempt ldconfig.
Ugh, UNIX permissions.
Don't test coverage on hpack_compat.py.
Implement header table size for nghttp2.
Revert "Implement header table size for nghttp2."

This reverts commit 998d743f6ae67f0f1ae94a5c7a0efaa0ea9a7e57.
Don't assert header table size here.