Add ignore for .idea
Add some mock fs tests

This is just a start to get a more complete read/write fs mock.
Fix removeTree for directories with only one child
Merge pull request #12
Simplify removeTree
1.4.1
Finish mock filesystem

Also, ported all filesystem tests to Jasmine.
1.5.0
Clean up FS mock fixtures
Convert all tests to Jasmine.

Also add coverage testing.
Change signature of FS.mock(path)
Add coverage report and some doc updates
Infer mode from content type in FS write and append
Allow the target type to be overridden in FS.symbolicCopy
Coerce string modes in makeDirectory
Allow alternate file system for HTTP file responses
Flesh documentation
README review
Breaking test for makeTree
Fix #15 mock makeTree