Increase Completion on from_import_dialog with std builtins

- Increase Completion on from_import_dialog with std builtins.
- PEP8 / Lint compliant.
- Add missing DocStrings.

![temp](https://f.cloud.github.com/assets/1189414/2355394/d47efe0e-a5d8-11e3-8585-f00b6ce7d058.jpg)

Brancho: feature/fromimport_completer :8ball: