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add logging of existing default port process on start

Merged Administrator requested to merge github/fork/ianmcnally/guess-existing-port-process-441 into master

Created by: ianmcnally

Hello awesome contributors,

In #441 (closed), there are was a request to guess the name of the existing process running on the default port when starting CRA. So, building on the incomplete yet solid work done in #454, this PR aims to complete that feature.

with a CRA app process found

screen shot 2016-11-02 at 16 37 20

It shows the app's name and directory.

Note: my-test-app is the name of a CRA app in ~/dev/test2

with a non-CRA process found

screen shot 2016-11-02 at 16 39 36

It shows the command name and directory.

without a process found

screen shot 2016-10-01 at 14 47 15

It shows the original, generic message.