App.import should throw exception when someone passes a bad type

\<strangelooper> rwjblue it doesn't look like the code is checking for anything other than if(options.type === 'vendor')  the else statement stuffs your asset into legacyTestFilesToAppend
\<rwjblue> yes, I know
\<rwjblue> I'm saying it should
\<strangelooper> oh, want me to make a pr with `else if( options.type === 'test' ){`'  ?
\<strangelooper> :-)
\<rwjblue> yes, then error in the final `else` case
\<strangelooper> cool