Merge pull request #67 from gwu-libraries/cron-jobs

Cron jobs - refs #58
Enhanced home view to show all libraries vs. individual library.  Added links on home page to select library filters.  Added url patterns for individual libraries.  Refs #55.
Merge pull request #69 from gwu-libraries/t55_library_urls

Enhanced home view to show all libraries vs. individual library.
readme changes to edit SNMP community string. ref #60
Added setting for SNMP community string. Fixes #60
Modified to read the community string from the settings file. ref #60
Merge pull request #72 from gwu-libraries/community-string

Community string, fixes #60
Django management command to map network hosts with ip addresses. Fixes #50
Pep8 changes
Added try block to handle the condition of no results from the database.
Bash script to be added as a CRON job for mapping network hosts with ip addresses. Fixes #73