Changing version to 2.1.9-SNAPSHOT.
Fix issues #93, #95, #96. Removing EXT_EXP, fixing checkbox for ie and chrome and adding usd price.
Removing useless ExtraDto, adding new OrderHistory.
Fixed issue #97. Adding usd/cny exchange ratte paging and earning calcuation.
Fixed issue #103. System error when open order details and removing usd price from order.
Fixed issue #101. Use unit 'ton' instead of 'kilogram'.
Changing version to 2.1.9
Merge branch 'develop'