Test PayplugPaymentService, make Router dependency optional
add before script travis
remove php 5.3.3 due to lack of openssl support, test on many symfony versions
fix travis conf
add travis badge in readme
create command to simulate an IPN
fix unused code, link to doc from readme
doc
Merge branch 'feature-simulate_ipn_command' into dev
Merge branch 'feature-tests' into dev
Merge branch 'dev'