Ability to extend plugin

[PaladinMattt]

This is a nice plugin, but it lacks the ability to be able to extend it. I have a few extension methods with the ability to set the filters dynamically, or export the store list to Excel, but it seems currently I must modify the javascript file instead of being able to include a separate extensions file.

[PaladinMattt]

For instance, there does not appear to be a way to access the "locationset" array from outside this plugin file, I think a more object oriented way would be to put he "variables used across multiple methods" into your constructor, and access them like properties.