#27 - Polished pom.xml.

Removed the declaration of the compiler plugin in favor of Spring Boot's java.version property. Removed obsolete repository declaration.
#28 - Upgrade to Spring Boot 1.1.9.

Updated to Tomcat 8.0.15 on the way.
#29 - Upgraded to Salespoint 6.0.1.
#26 - Upgraded to Salespoint 6.1.

Upgraded to Salespoint 6.1. Removed obsolete plugin declarations and customizations from pom.xml. 

Simplified application configuration by using the newly introduced @EnableSalespoint annotation. Switched to UserAccountManager.findByUsername(…). Added Apache license headers where missing.