use parent pom 1.2.7 => move to Java 7
Clean code :
- remove unused methods
- remove unused import
- improve javadoc
Add AutoCloseableSoftAssertions a version of SoftAssertions to use in try-with-resources statement to void the need to call assertAll(). (Fixes #235)
Add Javadoc CSS file and set maven to generate javadoc using it.
Add syntax highlighting in javadoc code examples
Update contributor guide