Ansible-taskrunner

* Fixed bug in cli invocation when specifying taskfile override [7a07d1a](https://github.com/berttejeda/ansible-taskrunner/commit/7a07d1af4060d96a487df4a8a69e347a94deb56e)
* Removed dependency on crayons package for ansi colors [9d985ef](https://github.com/berttejeda/ansible-taskrunner/commit/9d985ef7f4791e81aecad6475242d18050f6a8f9)
* Support for ad-hoc bastion-mode (no sftp config file) [9d985ef](https://github.com/berttejeda/ansible-taskrunner/commit/9d985ef7f4791e81aecad6475242d18050f6a8f9)

* Values from env should only be enabled by option tag [a792c52](https://github.com/berttejeda/ansible-taskrunner/commit/a792c5200da38ec59106f84a031e8298e7a6fb0b)

* Add support for choice options [5778948](https://github.com/berttejeda/ansible-taskrunner/commit/577894802bb3ce29cdd2bb298939eeeae6323371)
* Support for option values from environment variables [34f8c7b](https://github.com/berttejeda/ansible-taskrunner/commit/34f8c7b499c987c35ae2c1ad9ca5c9c20ab8c893)
* Added functionality for defining secure/insecure prompt options [1f43b63](https://github.com/berttejeda/ansible-taskrunner/commit/1f43b63f4fc3e5c93011ad93af374d3da46850d1)

* Bastion mode no longer depends on remote tasks command [e421130](https://github.com/berttejeda/ansible-taskrunner/commit/e4211305e931373327d3ccbc54367c90c60eefd9)

* Simplified options for main cli function [4abb784](https://github.com/berttejeda/ansible-taskrunner/commit/4abb7844b6c35379b1201e2ac4a6dcfee2d84615)
* Account for paramsets when deriving remote command [ac896c1](https://github.com/berttejeda/ansible-taskrunner/commit/ac896c19bcb4e74cbd89906e1c63cd680d39529b)
* Honors stderr/returncode for ansible cli provider [5601c61](https://github.com/berttejeda/ansible-taskrunner/commit/5601c618523085cf8b04d4a1a566c9ab1e325672)
* Reduce logging verbosity for paramiko client [126aad9](https://github.com/berttejeda/ansible-taskrunner/commit/126aad9aad8b30c77cbf6e73a9a2ce3ae039a266)

* Fixed invalid inventory in sample Taskfile.yaml [798b0b7](https://github.com/berttejeda/ansible-taskrunner/commit/798b0b789af627ca5f233e0111b37666b2c1e959)