Ignore generated Makefile
Add Rake to Gemfile
Add Rakefile for extension compilation
AMQ::Hacks => AMQ::Pack
Extract constants into a separate file

Preparing for reusing some Ruby code between pure and native versions
Extract exception classes
Initialize with packed indices
Move codegen helpers to AMQ::Pack
Short circuit if payload size is less than one frame minus offset
Install perftools.rb on all MRI versions
Remove outdated profiling document

Unfortunately, I can't get perftools.rb to work again
so we switch to ruby-prof which works fine on 1.9.3 and 2.0.0.
Switch to ruby-prof
Body encoding profiling script
Body framing benchmarking scripts