MAINT: remove restrictions on strings for generic loader
MAINT: remove restrictions on strings for generic loader

MAINT: remove catch for NonNumpyCompatible since it's a subset of NonPipelineCompatible

florentchandelier/zipline,bartosh/zipline,quantopian/zipline,alphaBenj/zipline,magne-max/zipline-ja,humdings/zipline,bartosh/zipline,humdings/zipline,quantopian/zipline,wilsonkichoi/zipline,alphaBenj/zipline,Scapogo/zipline,wilsonkichoi/zipline,enigmampc/catalyst,enigmampc/catalyst,magne-max/zipline-ja,Scapogo/zipline,florentchandelier/zipline