Merge pull request #6 from sergeyk/dev

Syncing dev with master
Merge branch 'dev'
Merge branch 'dev'
scraper for popular images on 500px
moving api key to config
fixed dropbox shared date folder link
Merge branch 'dev'
adding sublime project
pinterest analysis notebooks
better querying from mongo
added code to populate db if needed
Refactored inserting DataFrames into database
Merge branch 'h94h12-dev' into dev