Create Master Image Store Scanner

Create the main class which will scan the Master Image Store
(e.g. the Dropbox Folder) for directories and images etc.
Merge branch 'master' into scanner

Conflicts:
	README.md
Ignore any temporary files created by the Kate editor
Add Iguazu::MasterImageStore::Clients::Dropbox
Update Scanner and tests

Update Scanner and tests and add SimpleCov code coverage
Add required Environment Variables for Travis