Counter utility for esh:

To run this plugin on your shell, enter the following command from your /src directory:
   $ ./esh -p /web/courses/cs3214/spring2015/projects/student-plugins/crc1559_cgibs13/counter
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COMMANDS: 

    'counter' [string]

The user enters a string of any number of characters and this plugin counts
the number of characters and returns it.

Written by: Cody Cummings (crc1559@vt.edu) and Cameron Gibson (cgibs13@vt.edu) for CS-3214 @ Virginia Tech