CLI --help formatting

[rhagenson]

Currently, the CLI --help is especially wide which causes odd line wrapping unless the shell is equally wide. I have not investigated the solution yet, but before I potentially battle clap to make it so are there any initial oppositions to re-formatting the CLI to have less empty space around subcommands?

From:

...
    fastq-split              Split FASTQ file from STDIN into N chunks.
                             
                             Example:
                             rbt fastq-split A.fastq B.fastq < test.fastq
...

To:

...
    fastq-split
        Split FASTQ file from STDIN into N chunks.

        Example:
        rbt fastq-split A.fastq B.fastq < test.fastq
...

is what I am thinking (if I can make clap participate in such formatting).

(I could knock this out while working on #36 )