Mathoid: Open the POST end point to the public
Mathoid: Open the POST end point to the public

We have changed the POST end point to execute only tex check and
sanitisation, which addresses security concern about it. Consequently,
open it up to the public.

d00rman/restbase,wikimedia/restbase,cscott/restbase,wikimedia/restbase,Pchelolo/restbase,milimetric/restbase,wikimedia/hyperswitch,eevans/restbase,wikimedia/mediawiki-services-restbase,inverno/restbase,milimetric/restbase,gwicke/restbase,wikimedia/mediawiki-services-restbase,eevans/restbase,inverno/restbase,cscott/restbase,d00rman/restbase,Pchelolo/restbase,gwicke/restbase