CREDIT AGREEMENT DATED AS OF JULY 25, 2014 AMONG ORION ENGINEERED CARBONS S. À R.L., AS PARENT, ORION ENGINEERED CARBONS HOLDINGS GMBH, AS HOLDINGS, ORION ENGINEERED CARBONS BONDCO GMBH, AS INTERMEDIATE HOLDINGS, ORION ENGINEERED CARBONS GMBH, OEC...