[no-ref] Adding Github widget - requires Github client
[no-ref] Adding support for choosing cobertura metrics to clculate job avg.

You can specify metrics using this config:
```
"config": {
	"url": "http://ci.my.company/",
	"metrics": {
		"conditionals": 1,
		"lines": 1,
		"methods": 1
	},
}
```
Merge remote-tracking branch 'remotes/origin/develop'
buch of random fixes :)