hotfix: handling when div_id is null.
Refactored get_doc_info and added specs
Enable to create project by posting json
Enable to create project_docs by post json
Revised docs#show and divs#show json format
Added project.add_docs_from_json method

- to create docs from projects/:project_id/docs.json
Added update project annotations_updated_at method in project
Modified update annotations zip button style
Modified projects#show.json
Deleted old codes
Added project-info.json in project.zip
Added validates uniqueness of user.username
Create directory for project annotation zip if not exist
Revised docs#create_project_docs for json file upload
Modified application#http_basic_authenticate

- Added authentication failure error
Enabled to create project uploading json file
Fixed specs
Fixed mass assignment error in projects#create format json
Fixed json basic authentication
Renamed project-info.json to project.json