Complete unimported classes by simple name

[alexander-yakushev]

Very often I'm rewriting something from Java or going through a tutorial, and I have to use a Java class I don't know full package name of. So I have either to Google it, or search somewhere else, then type in its full name into :import clause.

Solution: Context-check if we are inside :import and then allow completing full classnames by a simple name.

[alexander-yakushev]

The solution is implemented in 6df7b81.