readme.md: add nuget downloads badge

remove .NET 3.5 support (#93)

code cleanup (#83)

update csproj, add missing LogLevel.cs

update http links in comments

Update README.md

tests: integration test stability (#81)

state: remove unused states

ticker: improve perf (#79)

updates to backoff strategy and min backoff multiplier (#74)

Producer/Consumer: log when connect to nsqd is successful (#73)

remove obsolete methods from IBus; closes #61

Example: Change NLog default colors (#70)

Timer: fix race condition (#69)

readme.md: replace travis with appveyor