added __coerce__ to ROP
added p24 and p24b
made @memoize better at guessing if it has arguments or not
Removed redundant code.
Merge pull request #21 from RobertLarsen/master

Removed redundant code.
hexii for shellcraft

$ shellcraft echo 'hello world' -f hexii
00000000  .h 01 01 01 01 81 .4 .$ .s .m .e 01 .h .o 20 .w |
00000010  .o .h .h .e .l .l .j 01 .[ .j 04 .X 99 b2 0b 89 |
00000020  e1 cd 80                                        |
00000023