update escodegen to latest so people don't have to install source-map
update escodegen to latest so people don't have to install source-map

slang800/TypedCoffeeScript,michaelficarra/CoffeeScriptRedux,pasberth/TypedCoffeeScript,ef4/CoffeeScriptRedux,ghempton/ember-script,gkz/coffee2ls,beni55/CoffeeScriptRedux,mizchi/TypedCoffeeScript,pasberth/TypedCoffeeScript,rmachielse/ember-script,btown-side-projects/friendscript,eventualbuddha/CoffeeScriptRedux,modernmsg/ember-script,rmachielse/ember-script,ghempton/ember-script,gkz/coffee2ls,modernmsg/ember-script