Python2 and Python3 Co-Compatibility

This release integrates crowell's Python3 port, and fixes some compatibility issues between Python2 and Python3.

Specifically, the test that I ran to check functionality on `bash`.

```
aslr
start
vmmap
checksec
getpid
distance $rsp $rbp
hexdump $rsp
peda searchmem '/bin/bash'
nextcall
nextjmp
tracecall
strings
```