fix path issues for upload to s3

i am an idiot. :)
Merge pull request #972 from fivetanley/patch-1

fix path issues for upload to s3
resolveWithEvent -> resolveOn
Merge pull request #974 from tchak/resolve-on

resolveWithEvent -> resolveOn
ignore bundle directory (for standalone bundling)
bump ember-dev
cleanup gemfile
don't rely on native forEach and consistency