When got HTTP 401 error in calling methods buyOrder2/sellOrder2, write an error log, for better diagnose.
Strip trailing zeros of price and amount in calling buyOrder2/sellOrder2 to avoid signature mismatching.
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.
Remove copyright headers at the wrong location.
Delete duplicate information from xchange-coinfloor/pom.xml.
Merge pull request #548 from sutra/develop

Upgrade maven license plugin to 2.6 and attach license check to validate phase
added an ignore plugin execution for Eclipse for the new  license-maven-plugin addition.
format code
url update [ci skip]
Add constant BTCChinaExchange.DEFAULT_MARKET.
Implement BTCChina buyIcebergOrder and sellIcebergOrder API methods.
Implement BTCChina cancelIcebergOrder API method.
Implement BTCChina getIcebergOrder and getIcebergOrders API methods.
Change order ID type from long to int, to make consistent.
Merge pull request #550 from sutra/develop

Implement BTCChina Trade API v1.7