Second attempt

[brl0]

This pull request addresses issues mentioned in #98 and #99, which I opened and have since closed, and bumps the version in #97 as well. In summary, this PR:

• prevents an error listing loaded objects with no name attribute;
• corrects situation in which context is not handed off properly (when run with python -m);
• adds python headers to the .konchrc file and defaults for some editors to recognize syntax;
• uses importlib rather than deprecated imp module;
• has a couple of trivial cleanups. As mentioned in my previous attempt, this is my first pull request, so my apologies for any missteps, and I would appreciate any appropriate guidance. Thanks for the cool tool.

[sloria]

Closing this for now; see my suggestion for splitting this into two PRs.