Expvars | Add agent check for golang expvars
Expvars| Add simple tests
Expvars| Mock the http call
Expvars| Better example file
Expvar| Use warning and continue instead of raising exception
Expvar| Add forgotten continue statement
Expvar| Add docstrings
Add function to format the metric names
Expvar| Use a more informative defaultname
Expvar| Make aliasing consistent with jmxfetch
Merge pull request #1016 from DataDog/rudy/golang-expvars

Rudy/golang expvars