fix "enter" in guard

- you must run guard from the root of the project
  for this stuff to compile

Change-Id: I8d35448f2c54c4ff59cfbcb792af1911f96ea8e4
Reviewed-on: https://gerrit.instructure.com/27669
Reviewed-by: Derek DeVries <ddevries@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Derek DeVries <ddevries@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

lib/handlebars/ember.rb

@@ -36,10 +36,10 @@ class EmberHbs
 
     def compile_template(name, template_string)
       require "execjs"
-      handlebars_source = File.read(Rails.root.join('public/javascripts/bower/handlebars/handlebars.js'))
+      handlebars_source = File.read('./public/javascripts/bower/handlebars/handlebars.js')
       # execjs has no "exports" and global "var foo" does not land on "this.foo"
       shims = "; this.Handlebars = Handlebars; exports = {};"
-      precompiler_source = File.read(Rails.root.join('public/javascripts/bower/ember/ember-template-compiler.js'))
+      precompiler_source = File.read('./public/javascripts/bower/ember/ember-template-compiler.js')
       context = ExecJS.compile(handlebars_source + shims + precompiler_source)
       precompiled = context.eval "exports.precompile(#{template_string.inspect}).toString()", template_string
       template_module = <<-END

lib/handlebars/handlebars.rb

@@ -133,7 +133,7 @@ JS
 
     # Compiles and caches the handlebars JavaScript
     def set_context
-      handlebars_source = File.read(Rails.root.join('public/javascripts/bower/handlebars/handlebars.js'))
+      handlebars_source = File.read('public/javascripts/bower/handlebars/handlebars.js')
       @context = ExecJS.compile handlebars_source
     end
   end