feat(contrib/ec2): add optional support for IAM instance profiles
re-revert "ref(tests): switch to example-dockerfile-http app"

example-dockerfile-http has switched over to ubuntu:trusty for better
compatibility with apps:run (busybox does not ship with bash).

This reverts commit ebded177705e257d8227a836bade85331d56f8d7.
feat(registry): deis-cache for saving meta data

This improves the registry speed with remote stores and
the developer UX by removing frightening warnings

Fixes #1780, fixes #1794
fix(builder): delete images on destroy
docs(hacking+README): clarify that deis CLI requires python 2.7
Merge pull request #1858 from johanneswuerbach/lru-cache

feat(registry): deis-cache for saving meta data
Merge pull request #2625 from sopel/support-iam-instance-profiles

feat(contrib/ec2): add optional support for IAM instance profiles
chore(store): remove redundant Makefile task
Merge pull request #2765 from mboersma/deis-cli-py27

docs(hacking+README): clarify that deis CLI requires python 2.7
Merge pull request #2775 from ngpestelos/remove-redundant-makefile-task

chore(store): remove redundant Makefile task
Merge pull request #2747 from bacongobbler/cache-images

fix(builder): delete images on destroy
Merge pull request #2750 from bacongobbler/example-dockerfile-http

re-revert "ref(tests): switch to example-dockerfile-http app"
fix(contrib): use tab indents for Makefiles
feat(builder): add cedarish/build target
chore(builder): bump cedarish