Added coinbase payout script
Update print statements to use print()
Use instant_buy

We don't keep any escrow in Coinbase, so we always need to buy BTC first
before we can send it along to users as a payout. We do have instant_buy
enabled. Our instant buy limit is $1,000 per week.
Coinbase script now fetches amount and fee from response
Added a note to bitcoin exchanges, and added int/string conversion for fees
Print JSON result if coinbase doesn't give a 200
deduct amount + fee from balance
Fix errors, check for negative balance
Improve my-tip ui
Removed unnecessary opacity rules
reduce data duplication by removing line numbers from PO files
reorganize the i18n files
remove partial chinese translation
don't omit header, transifex needs it
use transifex-client to upload and download translations
don't keep the dates in the PO files, they'd generate git noise
first run of `make i18n_download`
sync translations as part of the release process
automatically fetch transifex credentials from heroku
use a DB lock to coordinate cron jobs, fixes #2557