make store repository path case insensitive (#906)
make store repository path case insensitive (#906)

Store repository lookup path as lower case

Related to #560

PolymerLabs/typedoc,PolymerLabs/typedoc,TypeStrong/typedoc,TypeStrong/typedoc,TypeStrong/typedoc,PolymerLabs/typedoc,sebastian-lenz/typedoc,sebastian-lenz/typedoc,sebastian-lenz/typedoc