Created new call in pricelists for getting revisions
Update url for getting reviosions
Created test for getting pricelists revisions
Created call and test for getting pricelists diff
Created call for getting compared pricelists revisions for given connection and return thair diff as csv file
Updated content type for priselist revisions diff csv file
Implemented call for two way batches
Merge branch 'master' of github.com:miticdjd/beepsend-php