json: Add pristine from Python-3.3.3 tarball.
re-pcre: Allocate match span array of needed size.
re-pcre: Implement subset of sub().
re-pcre: sub(): support functional replacement arg.
re-pcre: Add dummy pos/endpos args to search()/match().
re-pcre: Match: add start()/end() methods.
re-pcre: search(): Implement pos arg support.
re-pcre: Implement module-level match().
re-pcre: Implement Match.groups().
re-pcre: Capture all possible subexpressions, even empty.
re-pcre: Add basic tests for module.
re-pcre: Bump version to 0.1.

Implements enough functionality to run json module.