add LittleBeeGeo_backend. TODO: 1. refine frontend. 2. integrated with crawlers/input
integrate frontend with backend

TODO: 1. clickable input
      2. doc
Merge branch 'master' of https://github.com/KirstenLiu/LittleBeeGeo
Merge pull request #7 from chhsiao1981/master

1. add web server as backend (LittleBeeGeo_backend). 2. integrated web server and frontend