fix(deis/client): `Exception.message` is deprecated for >= python2.7

Changes:
- use `Exception.args` tuple instead of `Exception.message`

Closes #2331
docs(installing_deis): import AWS provisioning docs
Merge pull request #2332 from kingcody/fix/exception-msg-deprecation

fix(deis/client): `Exception.message` is deprecated for >= python2.7
docs(installing_deis): refer to contrib/ec2
docs(README): add badge pointing to latest docs
style(README): change two badges' colors to match Deis logo
Merge pull request #2334 from bacongobbler/import-aws-docs

docs(installing_deis): import AWS provisioning documentation
Merge pull request #2337 from mboersma/add-docs-badge

docs(README): add badge pointing to latest docs
fix(contrib/userdata): nse uses `docker exec`

Fixes shells into the container not having the correct envvars
docs(deisctl): reword comment
fix(tests): Allow TLS

Fixes https://github.com/deis/deis/issues/2230
Merge pull request #2348 from Xe/fix/contrib-user-data/nse-uses-docker-exec

fix(contrib/userdata): nse uses `docker exec`
docs(README.md): replace moved DNS link
docs(contrib): replace moved DNS links
Merge pull request #2358 from Paperback/patch-1

docs(README.md): replace moved DNS link
docs(installing_deis): import baremetal docs
docs(contrib): refer to digitalocean guide
docs(testing): add better instructions for contributors
ref(docs): error on warnings for all Makefile targets
docs(*): add Troubleshooting Deis docs