add dropdown menu

updated wrong measure.rb

- change image names to match the OS object type
- include another path option for image lookup so they will show when running tests
- update .gitignore to ignore all test outputs

- removes hardcoded gridData json
- adds populateGrid to create the gridData object necessary for plotting
- adds  createGrid to assign positions in the grid
- adds assignImage to return the image file for a given object type
- adds splitOutdoorAirSystemObjects to split the outdoor air system object into two for grid plotting purposes. handles node attachments and assignments
- takes hvac_data out of an array; it is already an array. adapt code to account for the change.
- change high level names from object_name to loop_name
- change component_type to component_side for clarity