Initial commit.
Added layering order on sort. However, need to implement it in the initialization logic
Completed layer order functionality
Completed preliminary info window setup
Completed summary graph function
Added right click zoom to layer
Merge branch 'master' of https://github.com/lamkeewei/gis-assignment-one

* 'master' of https://github.com/lamkeewei/gis-assignment-one:
  Initial commit