Merge pull request #39 from vikramrajkumar/btsx

Merge upstream
check_wallet_status refactoring
INTEREST RATE(%) -> INTEREST RATE (APR) feature #391
zero price limit is shown as '-' (issue #392)
Add Total USD Supply next to Price Feed at top. #393
fix for issue #402 - asking for password when no existing wallet
fixed short tab balance click
repeats failed 401 or 404 rpc calls
Merge branch 'develop' into btsx