Added initial DAL.getFileList function
Added DAL function to retrieve list of files in states dir [#58246470] #42
Added service endpoint to view available backups [#58246470] #42
Added DAL function and service endpoint to swap current and backup states

[#58246470] #42
Created initial web interface to restore states [#58246470] #42
Added alertify and upgraded moment.js
Updated restore interface, DAL user input sanitization [#58246470] #42
Merge pull request #93 from adlnet/roll_back_feature

Roll back feature merge