Latest Meteor build 0.8.0 has RELOAD_SAFETYBELT token needs parsing

[jaywon]

In Meteor base app.html file in latest Meteor build 0.8.0, RELOAD_SAFETYBELT token has been added for parsing on application startup and with server.js occupying that function in pipeline token is not being parsed and displays on page. Still not sure why Meteor webapp.js is not parsing tokens and must be implemented here but this is the fix in conjunction with the previous HTML_ATTRIBUTES and RUNTIME_CONFIG parsing logic.

RELOAD_SAFETYBELT first implemented in commit: https://github.com/meteor/meteor/commit/276034617afea0ca7d65a31113a871e7b29b59f3