Fix: env rules merging for command line config (fixes #1271)

If the command line config file specifies environments, their
rules are merged before the individual rules in the same file.
Merge pull request #1466 from jrvidal/master

Fix: env rules merging for command line config (fixes #1271)
Docs: Update pages to fix rendering of lists and fenced code blocks
Merge pull request #1468 from DavidAnson/mdish

Docs: Update pages to fix rendering of lists and fenced code blocks
Docs: update badges
Merge pull request #1471 from yoshuawuyts/patch-1

readme: update badges
Build: Add check for license issues (fixes #782)