urlAdd can be a function that takes item as a parameter

see Issue #49

also, allow additional params to be added to ajax calls
Initial refactor
Update README
Add .jshintrc
Fix expanding/collapsing top level folder
Add indent width as an option
Fix TravisCI and update README
Fix destination for hgrid.css
Remove inline css for indent HTML. Add hg-indent class
Disable sorting for now
Add failing test for dropzone
Docs
Add HGrid::toggleCollapse

1 expected test failure
Remove dropzone as a hard dependency
Manage dependencies
Rename onAdd -> onItemAdded
README-driven development, lol
Pass correct context object to onClick and onAdd callbacks
Dropzone is initialized

All tests expected to pass
Rename dropZoneOptions -> dropzoneOptions and slickGridOptions -> slickgridOptions