initial draft for external metrics service
Merge branch 'dev' of github.com:etishor/Metrics.NET into dev

Conflicts:
	Src/Metrics/Visualization/MetricsHttpListener.cs
add internal error meter
add cpu count to environment data
add more performance counters
Update readme
Update README.md
Update README.md
cleanup readme
Update README.md
Update README.md
Move readme content to wiki
Update README.md
simplify text in readme
add more predefined units
add more samples
add method for scaling factor between time units
move value scaling to ValueSource instead of consumers
meter and timer values store the time unit they represent
remove remote registration for now