Lazily unpickling dictionary

Closes #29

See merge request !89

and __setstate__() doesn't run if the state is False.

Ensure that we always return a non-false state (another version bump
here).

Enable Py3.6 tests

See merge request !87

Dep resolve fixes

See merge request !86

Add a regression test for #23.

See merge request !85

Clean up use of 'iname' variable in generate_sequential_loop_dim_code (found by @mattwala)

See merge request !84

fix call with no return values and options, and add test

See merge request !83