Add a `log` object to script-stamping HB helper, so script-stamping can work.
Add a log
object to script-stamping HB helper, so script-stamping can do something other than fail. Also, tweak error messages.
Line 295 of blacklight-handlebars.js was calling log.info. But log.info never existed, so an exception was always thrown when a script-stamping operation was attempted. This is now fixed.