New class FailSavePickler. 
It is a subclass of Pickler, that can replace
otherwise unpickleable objects by surrogates.
CPython only: raise PicklingError on frame and trace-back.
Stackless can pickle these objects without problems.
Added / reformatted comments.
No functional change
Improved the FailSavePickler
- added recursion detection
- use the existing object replacement system
Test change only: turn off disassembling
Support pickling bound and unbound instance methods.
Add optional argument unpickler_class to SPickleTools.loads
and loads_with_external_ids.
test for None, not for a boolean value
Don't require RPyC and ssh any longer.
sPickle works perfectly without these modules. Only the examples require them.
PEP-8 fixes
Bump version to 0.1.4.