convert css to less

 - move main.css to less
 - move files in use from ./src to ./less
Merge pull request #424 from strongloop/feature/migrate-css-to-less

convert css to less

#377
add the ui code back for explorer view

- getting an exception : cannot load http://localhost:3000/explorer/resources. No 'Access-Control-Allow-Origin' header is present
- when trying to access the swagger meta data
- add properties retrieval to getAllModels call
- tweak name references to match latest api data
second cut reviving explorer ui

- some issue with 'new model' flow throwing exception
in explorer view but not affecting app flow
fix merge conflict with css transplant