Optionally support markupsafe
Optionally support markupsafe

This will allow the namesapce to provide information about
whether something is to be escaped or not.

clach04/pystache_old_v0.4.1,harsh00008/pystache,defunkt/pystache,harsh00008/pystache,jrnold/pystache,charbeljc/pystache,nitish116/pystache,arlenesr28/pystache,charbeljc/pystache,rismalrv/pystache,arlenesr28/pystache,nitish116/pystache,arlenesr28/pystache,nitish116/pystache,beni55/pystache,alex/pystache,harsh00008/pystache,beni55/pystache,dmfrancisco/django-pystache,jrnold/pystache,rismalrv/pystache,rismalrv/pystache