Expvar| Add support for wildcard to specify content to report
Expvar| Update the yanl example
Expvar | Document more deep_get function
Merge master and un-delete the go expvar checks
Expvar| Switch to a regexp based specification
Expvar| Add limitation to the number of metrics returned
Merge branch 'master' into rudy/golang-wildcard
Improvements to the go expvar check

* Use requests instead of urllib2
* Add memstats metrics by default
* Add tags at the metric_level
* Add path as a tag when an alias is set
Fix metric name
Merge branch 'master' into rudy/golang-wildcard
Fix utilisation of the GC circular buffer
Small fixes per PR review
Merge pull request #1049 from DataDog/rudy/golang-wildcard

Rudy/golang wildcard