Add BaseFinder class, and move Location, LocationList to finder.py
All finders inherit from BaseFinder
Fix Location imports
Fix for ExactTemplateFinder when searching in locations with a parent -- we need use the x/y coordinates relative to that location's image (and not the root image)
Merge pull request #43 from mdr/ExactTemplateFinder-fix

Fix for ExactTemplateFinder when searching in locations with a parent --...
Update README.md
Merge pull request #44 from ant1441/finder-base-class

Finder base class