Add ImportTest, testing import_files in commands.py.
Add ImportTest, testing import_files in commands.py.

Only tests "as-is" metadata imports, making sure that tracks are
copied to the library and named properly.

jackwilsdon/beets,mosesfistos1/beetbox,parapente/beets,multikatt/beets,jmwatte/beets,Wen777/beets,diego-plan9/beets,imsparsh/beets,shamangeorge/beets,andremiller/beets,parapente/beets,Dishwishy/beets,Andypsamp/CODjunit,moodboom/beets,Kraymer/beets,ruippeixotog/beets,Dishwishy/beets,mathstuf/beets,shanemikel/beets,jackwilsdon/beets,drm00/beets,lengtche/beets,swt30/beets,LordSputnik/beets,aspidites/beets,randybias/beets,mried/beets,jcoady9/beets,multikatt/beets,randybias/beets,shamangeorge/beets,dfc/beets,YetAnotherNerd/beets,jackwilsdon/beets,Andypsamp/CODjunit,moodboom/beets,randybias/beets,madmouser1/beets,Wen777/beets,xsteadfastx/beets,LordSputnik/beets,mried/beets,krig/beets,asteven/beets,aspidites/beets,kareemallen/beets,ruippeixotog/beets,dfc/beets,sadatay/beets,gabrielaraujof/beets,tima/beets,kareemallen/beets,artemutin/beets,bj-yinyan/beets,pdf/beets,marcuskrahl/beets,tima/beets,jmwatte/beets,m-urban/beets,shanemikel/beets,PierreRust/beets,kelvinhammond/beets,SusannaMaria/beets,moodboom/beets,untitaker/beets,pkess/beets,imsparsh/beets,ibmibmibm/beets,ruippeixotog/beets,Andypsamp/CODjunit,marcuskrahl/beets,sadatay/beets,PierreRust/beets,multikatt/beets,kelvinhammond/beets,xsteadfastx/beets,Andypsamp/CODfinalJUNIT,lengtche/beets,lightwang1/beets,parapente/beets,lengtche/beets,Freso/beets,andremiller/beets,jbaiter/beets,ngokevin/beets,beetbox/beets,jmwatte/beets,artemutin/beets,jcoady9/beets,bj-yinyan/beets,arabenjamin/beets,mclearc/beets,Andypsamp/CODjunit,Freso/beets,Wen777/beets,kelvinhammond/beets,diego-plan9/beets,YetAnotherNerd/beets,mosesfistos1/beetbox,mried/beets,tima/beets,untitaker/beets,artemutin/beets,gabrielaraujof/beets,jayme-github/beets,ttsda/beets,marcuskrahl/beets,ttsda/beets,MyTunesFreeMusic/privacy-policy,mathstuf/beets,jackwilsdon/beets,Dishwishy/beets,SusannaMaria/beets,lightwang1/beets,jcoady9/beets,dfc/beets,kelvinhammond/beets,marcuskrahl/beets,ruippeixotog/beets,mosesfistos1/beetbox,ibmibmibm/beets,MyTunesFreeMusic/privacy-policy,swt30/beets,Andypsamp/CODfinalJUNIT,shamangeorge/beets,jbaiter/beets,lengtche/beets,Kraymer/beets,arabenjamin/beets,kareemallen/beets,madmouser1/beets,shanemikel/beets,m-urban/beets,beetbox/beets,Andypsamp/CODjunit,mclearc/beets,kareemallen/beets,jmwatte/beets,dfc/beets,LordSputnik/beets,asteven/beets,arabenjamin/beets,LordSputnik/beets,asteven/beets,lightwang1/beets,diego-plan9/beets,beetbox/beets,moodboom/beets,PierreRust/beets,sampsyo/beets,ibmibmibm/beets,sadatay/beets,xsteadfastx/beets,multikatt/beets,Andypsamp/CODfinalJUNIT,gabrielaraujof/beets,untitaker/beets,sampsyo/beets,krig/beets,mathstuf/beets,ttsda/beets,mosesfistos1/beetbox,Freso/beets,Kraymer/beets,randybias/beets,jayme-github/beets,sadatay/beets,gabrielaraujof/beets,MyTunesFreeMusic/privacy-policy,pkess/beets,m-urban/beets,pkess/beets,pdf/beets,m-urban/beets,YetAnotherNerd/beets,jcoady9/beets,diego-plan9/beets,ibmibmibm/beets,madmouser1/beets,MyTunesFreeMusic/privacy-policy,mried/beets,YetAnotherNerd/beets,krig/beets,untitaker/beets,bj-yinyan/beets,drm00/beets,lightwang1/beets,swt30/beets,SusannaMaria/beets,PierreRust/beets,parapente/beets,Dishwishy/beets,drm00/beets,mclearc/beets,ttsda/beets,asteven/beets,sampsyo/beets,imsparsh/beets,mathstuf/beets,beetbox/beets,pkess/beets,SusannaMaria/beets,Kraymer/beets,arabenjamin/beets,andremiller/beets,shamangeorge/beets,ngokevin/beets,Andypsamp/CODfinalJUNIT,Andypsamp/CODfinalJUNIT,tima/beets,swt30/beets,imsparsh/beets,bj-yinyan/beets,madmouser1/beets,artemutin/beets,Freso/beets,shanemikel/beets,drm00/beets,sampsyo/beets,xsteadfastx/beets