Merge branch 'add_tests' into tmp
Merge branch 'add_tests' into tmp
Added test for database.direct.updateDataset
Added missing scale parameter in comment, use old metadata url
Use scale parameter in ContentDB, in updateDataset()
Split most test methods into separate all and dataset methods
raise PyslidException instead of returning nothing
raise PyslidException on errors
features.has should return a bool except for unexpected exceptions
Revert "Removed all references to PyslidException for now"

This reverts commit a6c2bfadd960ad3cdc51c65775b33e88e17280ad.