Import function enhancements

[ProjectMoon]

It would be nice to allow the import function to import more than files. If I come up with a file format for describing a namespace, we could import that and have import execute all files inside it. It would also be lovely to enable Maven repository downloading. Perhaps use Ivy for this task.

Import Paths

The import function should have a paths property of type list. This property will be searched for finding places to import the specified file. It will default to the current working directory and the location of the standard library. The import function should also implicitly add .eve if a file passed to it does not have .eve on the end of it.

Maven Repositories

This could be much more difficult, but it is worth it. Given a URI like mvn://commons-cli/commons-cli/1.2, it should download the dependency and add it to the classpath at runtimme. We can probably use Ivy's Java API for this, although I understand it is difficult to use.

[ProjectMoon]

Can probably also optimize import statement to use EveCore#run(Script). The code looks to be an exact copy.

[ProjectMoon]

Don't think namespace import is really all that necessary...

[ProjectMoon]

Closing, and moving paths functionality to a global variable.