Fix #68. Print a note when files can't be removed.
Fix #68. Print a note when files can't be removed.

Rather than failing outright, just keep a log of all the files that couldn't be removed, and then tell the user how to fix the situation on process exit.

segrey/npm,rsp/npm,chadnickbok/npm,kriskowal/npm,kimshinelove/naver-npm,misterbyrne/npm,TimeToogo/npm,evanlucas/npm,evocateur/npm,thomblake/npm,xalopp/npm,kimshinelove/naver-npm,yyx990803/npm,cchamberlain/npm-msys2,rsp/npm,yyx990803/npm,evocateur/npm,DaveEmmerson/npm,thomblake/npm,yibn2008/npm,segment-boneyard/npm,princeofdarkness76/npm,cchamberlain/npm,kemitchell/npm,cchamberlain/npm-msys2,cchamberlain/npm,ekmartin/npm,haggholm/npm,thomblake/npm,TimeToogo/npm,lxe/npm,cchamberlain/npm-msys2,segmentio/npm,segmentio/npm,xalopp/npm,yyx990803/npm,Volune/npm,evocateur/npm,rsp/npm,kriskowal/npm,segrey/npm,DIREKTSPEED-LTD/npm,DaveEmmerson/npm,segment-boneyard/npm,chadnickbok/npm,haggholm/npm,yodeyer/npm,evanlucas/npm,kriskowal/npm,princeofdarkness76/npm,kemitchell/npm,DIREKTSPEED-LTD/npm,chadnickbok/npm,lxe/npm,misterbyrne/npm,segmentio/npm,midniteio/npm,princeofdarkness76/npm,haggholm/npm,segrey/npm,TimeToogo/npm,yodeyer/npm,xalopp/npm,ekmartin/npm,ekmartin/npm,midniteio/npm,lxe/npm,kimshinelove/naver-npm,yibn2008/npm,yibn2008/npm,DIREKTSPEED-LTD/npm,Volune/npm,segment-boneyard/npm,evanlucas/npm,Volune/npm,DaveEmmerson/npm,yodeyer/npm,misterbyrne/npm,kemitchell/npm,cchamberlain/npm,midniteio/npm