update fluent assertions package
publish to nuget
added unit tests for owin metrics adapter
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Src/Metrics.Tests/packages.config
updated fluent assertions version
resolved unit tests failing due to the use static metric class sharing registry between tests
Merge branch 'dev'
Merge pull request #16 from alhardy/master

Unit tests for owin metrics adapter
Merge branch 'dev'