Squashed commit of the following:

commit a0ba9e2774af2cae992359aedf32820840677274
Author: Nick Holub <nikholub@gmail.com>
Date:   Wed Mar 5 14:59:56 2014 -0800

    fix #MLHR-864 Installer - Handling Hadoop Not Found

commit ed57803f6014fd219bf921a9c795773ee5c51659
Author: Nick Holub <nikholub@gmail.com>
Date:   Wed Mar 5 14:45:29 2014 -0800

    fix #MLHR-819 Installer - System Properties Section
Merge pull request #750 from nickholub/inst7_pull

Installer Update - Handling Hadoop Not Found