migrate KrakenExchange to ValueFactory as a nonce generator
Merge pull request #542 from rafalkrupinski/nonce-kraken

migrate KrakenExchange to ValueFactory as a nonce generator
Merge pull request #544 from sutra/develop

Strip trailing zeros of price and amount in calling BTCChina buyOrder2/sellOrder2 to avoid signature mismatch
Add security pairs to Cryptotrade.
Fix Cryptotrade ESL/LTC security pair.
Merge pull request #547 from jamespedwards42/develop

Add security pairs to Cryptotrade.
Upgrade maven license plugin to 2.6, and use the license template instead of custom header, so that this plugin can be executed in submodule directory individually.
Attach license check to validate phase, so that we will not forget to add license header to new file.