Coverage by package (#230)
Coverage by package (#230)

In addition to the the function level coverage information, these commands will now also append a section called `Package coverage`:

 * `make coverage-unit`
 * `make coverage-integration`
 * `make coverage-all`

Here's an example output (only the new portion of it):

```
Package coverage:
github.com/almighty/almighty-core                                                18.00%
github.com/almighty/almighty-core/app                                               n/a
github.com/almighty/almighty-core/app/test                                          n/a
github.com/almighty/almighty-core/client                                            n/a
github.com/almighty/almighty-core/criteria                                       52.40%
github.com/almighty/almighty-core/design                                            n/a
github.com/almighty/almighty-core/migration                                         n/a
github.com/almighty/almighty-core/models                                         30.70%
github.com/almighty/almighty-core/query/simple                                      n/a
github.com/almighty/almighty-core/remoteworkitem                                  4.80%
github.com/almighty/almighty-core/resource                                          n/a
github.com/almighty/almighty-core/test                                              n/a
github.com/almighty/almighty-core/tool/alm-cli                                      n/a
github.com/almighty/almighty-core/tool/cli                                          n/a
github.com/almighty/almighty-core/transaction                                       n/a
```

The code looks awfully complicated, I know, but I did it this way to avoid the use of `find` which caused problems on Windows.

* Added package level coverage output to coverage-(unit|integration|all)
* Create more readable go test line
* Removed unused envronment variable from Makefile

ldimaggi/almighty-core,ldimaggi/almighty-core,ALMighty/almighty-core,ldimaggi/almighty-core,ldimaggi/almighty-core