Add Actions class

[GoogleCodeExporter]

Actions class will allow customization of python-patch behavior like 
interactive/automatic mode, create/remove files, readonly check if the tree is 
patchable, show patch plan for confirmation by user.

Original issue reported on code.google.com by techtonik@gmail.com on 27 Sep 2010 at 8:36

• Blocking: patch should create files (and folders) if the don't already exist #3

[techtonik]

One of possible implementations. Not necessarily the best one. Event emitter / handler may be called differently.