adds tasks for build and release gem
rename load_history
change labels in load_history
rename demoCotacoesHistoricas
moving to historic_assets
renaming to historical asset length
rename to filename
rename origin_code
rename created_date
rename imported_date
rename create_assets
rename date
rename bdi_code
rename market_type
rename code
rename name
rename spec
rename currency_ref
rename price_opening
Revert "rename price_opening"

This reverts commit f4ef8998fbdb251470f526ec905fb7d2a05e4667.