Support Jest collectCoverageFrom option

[robcaldecott]

jestjs/jest#1211

When Jest performs code coverage, it seems to only cover the files that were tested instead of all files in my source directory. This gives a skewed percentage of files tested.

Jest 15 added a new config option for this called `collectCoverageFrom``

Can we have support for this in CRA?

[gaearon]

We can add it to our config. Should it just look at app's src/? Would you like to send a PR?

[mackbyte]

Seems someone else raised a PR:

pick up all files for coverage reporting #905

[mackbyte]

Any update on this ? Is the PR acceptable ? I notice its not CLA signed so does it need to be resubmitted ?

[mackbyte]

I submitted a pull request #961
Let me know if its acceptable.

[gaearon]

Fixed in #961, will be out in 0.8.0.

[gaearon]

It is also configurable in the next version.
#1830

[gaearon]

Please help beta test the new version that includes this change!
#2172