SI-5994 battling implicits for String.lines

Deprecated ProcessBuilder's lines method and renamed it lineStream.

stream was another possibility, but that seemed more likely to cause conflicts.

streaming was also tried, but feedback was in favor of lineStream.

Also updated tutorial in ProcessBuilder.

I am sure this will break some tests, but because of the name conflict it's hard to be sure where they are.  So Jenkins gets to find the problems for me.

Changed name to lineStream.
Merge pull request #3454 from Ichoran/issue/5994

SI-5994 battling implicits for String.lines