Merge tag '1.3.1' into develop

v1.3.1
- Fix: download the right Chromedriver for multiple platforms
Fix: end() requires a variable
Fix: detect the operating system, not the CPU architecture
Fix: defaults section now optional in storyplayer.json
Fix: added missing expectsBrowser()->doesntHave() (was documented, never coded)
Fix: -e switch has no effect when only one environment defined
Fix: can play tales once more
Tweak: improve output when summarising tales
Version bump
Merge branch 'release/1.3.2'