added hexdump to pip install

hexdump wasn't installed by default, but used in static2. Although the import
was in a try-catch block, various uses were not guarded and resulted in an
error. Easiest solution: install hexdump.
Merge pull request #30 from nedwill/master

x86_64 should just work as it is in the same group as x86
* create instruction targets at disassembly instead of in dests() call.
Merge pull request #32 from dbrumley/hexdump_problem

added hexdump to pip install
Merge branch 'arm-static' of github.com:dbrumley/qira