Add tests for the CommonOptionsParser
Add tests for the CommonOptionsParser

Unit test both the features & do real behaviour tests with the 'list'
command.

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