Fix parsing of long INTs
Compatibility with versions <R16
Merge remote-tracking branch 'wgnet/master' into long-int
Tests for parse INT opcode
One more test for BININT parser
Support for parsing pickle version < 2.

Since v2 parser is able to parse v0 and v1 dumps, we just don't
require version prefix.
Pickle v0 and v1 serializer.
Pickle protocol v0 and v1 deserializer; fixed negative long bug #4
Bump version
Merge pull request #5 from seriyps/old-protocols

Older protocols