1.2.0

Fixes:

• Fix *.locahost is resolvable with nss-myhostname (#173)
• Fix consul flaky tests by updating Consul version. (#171)
• Check if port index fits in bounds. (#164)
• Fix consul download problems on Travis. (#162)

Improvements:

• Make github releases from Travis. (#177)
• Add Sentry.io support. (#165)
• Move all build logic and dependencies installs to Makefile. (#155)
• Support Marathon 1.4. (#148 #151)