This CL adds the doc-string of Go variables (if available) to the python
getter and setter functions, for both CPython2 and CFFI.
Update TestBindVars accordingly.
- Remove the generating builder python script.
- Now, genCFFI interface is same as the genCpy.
- Support builtin-types Vars and Consts.
- Pass empty.go
- Pass cgo.go
- Pass vars.go
- Pass consts.go
Updates: go-python/gopy#102