First (really messy and not complete) implementation of the property file importer
Fixed gradle path, solved JUnitRuleMockery issue
Complete importProperties. Still really messy and ugly, but at least coverage is 100%. Missing unit test for upsert in CobrandDAO, it is indirectly tested by CobrandCreatorTest: it may make sense to unit test since it fails when both conditions are false, and such conditions does not verify right now

Change dependencies: rely on mongo-java-driver provided by Morphia, add org.apache.commons:commons-lang3:3.1
Style refactoring using static private methods where possible and 'factories'
Use meaningful _id field. Minor refactoring grouping repeated Strings into constants
Trying to use threads and concurrency

Review thread generation

Holder implements Callable: now they are responsible to create and return the owned collection. Consequentially, use Future
domains collection loaded from properties
Properties file feature