fixes #17
Fix date format related issues

Synchronization/instance sharing, typos
Fix more findbugs warnings
Fix more findbugs warnings
optimize for ref #14
@Ignore
Fixes #14 - improve doesNotHaveDuplicates performance when a custom comparison strategy is used
refactoring : remove Embedded class that was actually not needed and avoid the algorithm duplication
Fixes #14 : minor refactoring
Fixes #14 : StandardComparisonStrategy was not working with list of arrays
Fixes #17 : add code examples in javadoc
Fixes #17 : add doesNotContainEntry assertion in MapAssert