Version 2.0.0 of InstanceSync

This version does a lots of code clean up as well as adds several features.

* The main feature added is retry on error, by default the script will now retry the sync process if an error happens. 
* The user can now set options in the script via the exported environment variables.
* The script can now also take additional excludes via user input in the form of ``export USER_EXCULDES="file1 file2"``
* The script now supports VERBOSE mode as well as DEBUG for further trouble shooting.