Fix command spec parsing.
Fix command spec parsing.

"!" is a valid command name.

--HG--
extra : rebase_source : 3c99e0524fb81b84ebcf1546026fcb102ec9c6c7

madand/pentadactyl-pm,Quicksaver/vimperator-labs,derenio/vimperator-labs,airodactyl/dactyl,nathyong/dactyl,nathyong/dactyl,stemar94/vimperator-labs,nathyong/dactyl,moonshadow/dactyl,derenio/vimperator-labs,airodactyl/dactyl,moonshadow/dactyl,nathyong/dactyl,zklinger/vimperator-labs,moonshadow/dactyl,zklinger/vimperator-labs,invl/dactyl,Evidlo/vimperator-labs,Kjwon15/dactyl,invl/dactyl,5digits/dactyl,airodactyl/airodactyl,nullren/vimperator-labs,seanmorton/vimperator-labs,Quicksaver/vimperator-labs,5digits/dactyl,5digits/dactyl,invl/dactyl,Kjwon15/dactyl,airodactyl/dactyl,airodactyl/dactyl,madand/pentadactyl-pm,5digits/dactyl,mcarton/vimperator-labs,airodactyl/airodactyl,madand/pentadactyl-pm,Sheile/vimperator-labs,invl/dactyl,airodactyl/dactyl,paretje/vimperator-labs,moonshadow/dactyl,madand/pentadactyl-pm,paretje/vimperator-labs,Kjwon15/dactyl,nathyong/dactyl,invl/dactyl,Sheile/vimperator-labs,5digits/dactyl,seanmorton/vimperator-labs,Kjwon15/dactyl,madand/pentadactyl-pm,moonshadow/dactyl,nathyong/dactyl,stemar94/vimperator-labs,Kjwon15/dactyl,moonshadow/dactyl,madand/pentadactyl-pm,Evidlo/vimperator-labs,Kjwon15/dactyl,invl/dactyl,mcarton/vimperator-labs,5digits/dactyl,airodactyl/dactyl,nullren/vimperator-labs