go get failed

Fixed #8 "go get" fails

vhost support, typo, timeout, build info

• Fixed typo in "messages_confirmed_total". (Thanks to @prfalken)
• Vhost label added (Thanks to @hudashot)
• Timeout added to http client. Possible leak. #9
• Build info added as metric rabbitmq_exporter_build_info
• Updated dependencies

Fixed unclosed connections

• Bugfix: Connetions were not closed. Caused "too many open files" #3, #4
• New build process using promu
• vendored dependencies

pre-release: Merge pull request #1 from KevinPike/master

set log level using environment

added message_stats

v0.10.0

Added message_stats counters for queues

First release

Should work like a charm but needs more testing.