LUN-367: Added filer models for Archive file type.
LUN-367: Added view for models.
LUN-367: Can now extract small zip files.

There seems to be some memory leak in the code.
Too many files are open.
LUN-367: Moved extract to dropdown menu.

Restructured code a bit.
LUN-367: Make pep8 corrections.
LUN-367: Add tests for zip extract
LUN-367: Add logical path tests.
LUN-367: Code Review; Remove Media class from ArchiveAdmin.
LUN-367: Code Review; Close remaining zip file.
LUN-367: Code Review; Validate for duplicates.
LUN 367: Code Review; Restructured code
LUN-367: Code Review; Restructured Code Part 2.
Merge pull request #4 from pbs/LUN-367