Sheldonys-zappa

* Small fixes for 918, 922, 803, 802, 799, 888, 903, 893, 828, 874, and others.
* Support for manylinux wheels Python 3.6 package downloading.
* Py3 `certify` fixes.
* Add support for multiple expressions when scheduling
* Fix content-type headers not passing through on DELETE
* Avoid creating __init__.py in a directory next to a module (.py file) with the same name
* Check recursively if there is any .py{,c} file in a directory before creating __init__.py
* Fix SNS event tasks
* Bump lambda-packages

* Cached manylinux wheel installed
* New dependency installation formatting
* Clarify "stage" vs "environment" terminology in code
* Fix problem with capitalized packages
* Delete local package if using wheels version. This saves several MBs on package size in some cases (e.g. numpy).
* Thanks to mcrowson, nikbora and schuyler1d

* Various Python3 fixes
* Remove some dead code
* More binary package fixes thanks to and nikbora and bxm156
* Improved async tasks thanks to schuyler1d
* Various small changes

* Support for new `lambda-packages` format (Python3 support)
* Fix `setup.py` on Windows Python3
* Fix 818 - python3 import for LE
* Support AWS-specific environment variables (with KMS)

* Add `template` command
* Add `--json` in more places
* Add `--output` to package
* Support for manylinux wheels Python 3.6 package downloading 803
from nikbora
* Fix PyEnv exit code 799

* Add Python3 Support! 793, 6
* Deprecate `lets_encrypt_expression`
* Refactor a bunch of stuff to work with Python3 package restrictions >:[
* 776 fix for libmysqlclient.so.18 error when using `slim_handler`
* add profile and region detection to init - thanks pdpol
* 774 Wsgi environment improvements (Fix untrustworthy remote_addr)
* Only create `__init__.py` file if there are python files or sub dirs in the folder
* Update docs to reflect lambda name prepended to role_name
* Guard log responses (thanks scoates)