assert master url scheme and netloc

Merge pull request #641 from pooya/pr_640

Add scheme for "https"

Update .travis.yml

Merge pull request #637 from amock/fixr18

Update to build with OTP 18

update travis build matrix

update copyright years

Merge pull request #625 from ErikDubbelboer/formatting

Fix formatting of sizes between 1000 and 1024

Merge pull request #617 from sloweater/bug_fixes

Fix badrecord bug for fail_info.

Fix avg usage and threshold calculations.

docker: work around the new limitations of sshd in newer versions of Ubuntu

Merge pull request #606 from sloweater/local_files