check if hd_wallets table exists before trying to create any
More informative error on wallet creation failure
Move tests closer to HD wallet
default to mainnet if coinRPC is not running

this makes sure deposit page is always renderable
add activated and verified trates to member factory
add integration test for hd address generation
change extract_coin_property to class method

https://github.com/peatio/peatio/commit/0f68e8ad3876965a34d202bb296dc201e61981f8#commitcomment-5687492
default to one deposit address, allow user to refresh if used
check in schema diff