Add OSX homebrew instructions to readme
Merge pull request #12 from mariovisic/readme

Add OSX homebrew instructions to readme
fix fast-test target
exit with correct codes
add subclassed callback
treat def and class as 'statements'
autoregister tests
prepend require path on -I
remove String#format and String#%
add sl_make_formatted_string
add Method#inspect
don't allocate array unless method has rest args
add reg type to insn union
rename emit_immediate to op_immediate, all immediate insn emissions are through emit_immediate
s/emit_send/op_send/
add emit_uint
add emit_reg
add emit_id
remove str from sl_vm_insn_t
add emit_imc