Merge branch 'master' into feature/elixir-1.1.1

Conflicts:
	.travis.yml

Try OTP release 17.0

Version bump and fix README.md

Version bump

Fix package config

Merge pull request #13 from stuart/feature/elixir-0.15

Update to use webdriver 0.5.0

Merge pull request #13 from stuart/feature/elixir-0.15

Update to use webdriver 0.5.0

Merge pull request #11 from stuart/feature/screenshot

Added save_screenshot

Merge pull request #10 from stuart/feature/javascript_execution

Added javascript calls

Set retry time instead of number of tries.