Merge pull request #13 from namero999/pull-requests

Added constructors to Client and Payment to accept id as parameter
Update README.md, add Travis CI indicator
Update README.md, trigger Travis CI manually
Add secure keys to travis.yml
add keys to pom.xml
uppercase snapshot suffix
Update README.md, trigger Travis
Fix failing tests
prep for mvn central
web hook update fix
Add support for fee property
Fix tests
Add method for creating a transaction with a fee
Merge remote-tracking branch 'upstream/master'