Add us_stocks controller
Finish google finance parsing
add gem: nikkou & pry-byebug
GoogleFinanceParse: provide merged data
tmp commit
new model: StandardItem
new model: ItemStandardItemPair
1. add column to statements: end_date (fiscal period end date of a statement)
2. statements' quarter can be null
new model: ItemStandardItemPair
1. add column: namespace to items
2. minor changes in validation
Remove uniqueness check from database
rename exact_match to is_exactly_matched
Refine uniqueness validation
Finish basic implementation of US market
1. set guard-livereload to require: false
2. minor changes to routes
add counter cache
Merge branch 'feature/google_finance_parser' into develop