Revert "[xml mode] Allow dashes in tag names"
Revert "[xml mode] Allow dashes in tag names"

This reverts commit 81b7760c7953482310491578cd37eb4beb046db3.

mtaran-google/CodeMirror,crazy4chrissi/CodeMirror,ejgallego/CodeMirror,mtaran-google/CodeMirror,pabloferz/CodeMirror,namin/CodeMirror,ejgallego/CodeMirror,MarcelGerber/CodeMirror,ficristo/CodeMirror,grzegorzmazur/CodeMirror,nightwing/CodeMirror,notepadqq/CodeMirror,SidPresse/CodeMirror,jkaplon/CodeMirror,dperetti/CodeMirror,schanzer/CodeMirror,pabloferz/CodeMirror,namin/CodeMirror,schanzer/CodeMirror,hackmdio/CodeMirror,kerabromsmu/CodeMirror,thomasjm/CodeMirror,thomasjm/CodeMirror,wingify/CodeMirror,jkaplon/CodeMirror,namin/CodeMirror,pabloferz/CodeMirror,hackmdio/CodeMirror,jayaprabhakar/CodeMirror,dperetti/CodeMirror,schanzer/CodeMirror,kerabromsmu/CodeMirror,jayaprabhakar/CodeMirror,ficristo/CodeMirror,jayaprabhakar/CodeMirror,nightwing/CodeMirror,wingify/CodeMirror,nightwing/CodeMirror,ejgallego/CodeMirror,mtaran-google/CodeMirror,codio/CodeMirror,SidPresse/CodeMirror,codio/CodeMirror,notepadqq/CodeMirror,notepadqq/CodeMirror,SidPresse/CodeMirror,MarcelGerber/CodeMirror,jkaplon/CodeMirror,codio/CodeMirror,hackmdio/CodeMirror,ficristo/CodeMirror,kerabromsmu/CodeMirror,thomasjm/CodeMirror,MarcelGerber/CodeMirror,crazy4chrissi/CodeMirror,grzegorzmazur/CodeMirror,dperetti/CodeMirror,wingify/CodeMirror,grzegorzmazur/CodeMirror,crazy4chrissi/CodeMirror