Merge pull request #251 from parker-ldc/master

Updated version of FusionIndex class
quickMenu, commentary and video icon, video support
renamed Index#get_item_metadata to getItemMetadata
Merge pull request #252 from langtech/refactor-get-item-metadata

renamed Index#get_item_metadata to getItemMetadata
google login and archive button is implemented
comments are added for new functions and classes
Merge pull request #253 from lisaslyis/master

This commit resolves #246, resolves #247, resolves #248, is related to #231