Add support for video search
Add support for video details
Update usage examples in README
Change signature of api object to take in an object for credentials
    instead of discrete parameters
    Fixes #10
Update image download to use new endpoint
Add support for video downloads
Add support for video details
Add launch.json to enable interactive debugging
Update images details to use newer endpoint with ids=x,x,x,x parameter
    in order to allow for larger number of ids to be passed in
Update README with correct info after changes to SDK
Add filetype and height parameters to image download
Add support for events
Lint all js files with eslint
Add countries functionality
Remove mocha dev dependency