Add logging for mobile nodes

[hoffmabc]

This is to support PR https://github.com/OB1Company/native-bazaar/pull/830
on the Haven repo.

[coveralls]

Coverage increased (+0.05%) to 35.622% when pulling a9de517 on mobile-logging into deab8d1 on master.

[placer14]

Probably just need to test this works properly on both platforms. GTM otherwise.

[placer14]

I tried to test this but was unable to get my build to complete (On Android Studio, it failed while it was syncing gradle? Are there build instructions anywhere?). Can we get a confirmation on whether this works or not before we merge? /cc @hoffmabc @drwasho

[placer14]

Looks like this will only log ob-go to stdout and will put both ob-go and ipfs logs to file. We might consider not having logs to stdout for mobile. They're visible in logcat, but it's overhead that very few will take advantage of.