fixes #324 - Don't try to read CA signed certs as foreman user before cleaning with puppetrun

fixes #84 - add better support for binary path searching, and catch errors based on the output from puppetrun

fixes #84 - Add puppetrun support to web interface

fixes 162 - Certificate will not be removed when FQDN has uppercase letters

switches global setting var to be a constant var - refs #100

Fixes #111 - GW::puppetca#clean now logs an error and fails when there in no CA

Fixes #74. Logger messaging works in the proxy module

A logger method was introduced as well as a mechanism for logging if this
code is run as a standalone cgi service

fixes #74 - tftp and puppet ca errors are not shown in the log file

added some basic error handling

Changed default TFTP dir to be a subdir of GNI.