WIP GEOMESA-265, 264 Create a tools wrapper shell script and Make output for `list` command line tool prettier

This is just a basic wrapper shell script for Geomesa Tools,
but it comes with some important features. The first is that it can
help with configuring environment variables through the `geomesa configure`
command. This will prompt the user to set the required variables if
they aren't already set. It will also put `geomesa` on the path and set up
GEOMESA_HOME based on the root directory of geomesa. Now, one can run commands
just by typing `geomesa ...` instead of running commands through the JAR file.

Additionally, the output of `geomesa list` was improved to show more details and
appear prettier and easier to read.

Looking for comments/ideas/improvements for the wrapper, especially with storing the environment variables!
Following the Accumulo pattern actually greatly changes things with how we're parsing commands using scopt...If we kept things relatively the same as we have it now, it'd look like  
`geomesa export -u user -p password ...`

Would that work?