Add basic setup.py.
Started MemoryFile implementation.
Add more tests for MemoryFile.
Started MemoryFS implementation with mkdir.
Add test for MemoryFS.get_node().
Improve MemoryFS.mkdir() test.
Handling of parent of root MemoryFS().
Check MemoryFS.get_node() failure condition.
MemoryFS.mkdir(): Exception if dir exists.
Add pylintrc.
Allow to use MemoryFile in with statement.
MemoryFS: Implement opening files for write.
Open MemoryFile on creation.
Implement append mode for MemoryFS.open().
MemoryFS: Test overwriting of files.
MemoryFS: Test reading of files.
Implement MemoryFS.makedirs().
MemoryFS.makedirs(): raise exception if exists.
Implement MemoryFS.rename().
MemoryFS.rename(): Raise exception if dest exists.