Extension skeleton added.
Add dealloc, new, init and ping functions.
add libgibsonclient's method stubs
vaious additions to initial pygibson

* setup.py configured to include all sources into sdist
* PYGIBSON_DEBUG macro added
* tests layout added (runner included, just do ./runtests.sh)
add exception classes for wrapping gibson errors
add pygibson_set_exception() for convenient exception setting
processResponse() added
fixing tests runner
processing GB_ENC_NUMBER for REPL_VAL added
processing GB_ENC_PLAIN for REPL_VAL added
tox added
processing REPL_KVAL added
allow running tests with gdb
wrap gb_set and gb_get commands
mset && mget implemented
update to latest libgibsonclient upstream
some fixes for tests
libgibsonclient update
ttl && mttl implemented. generic commands added.
add del && mdel commands. rename del->dl, mdel->mdl to avoid clashes with python keyword 'del'