Move static helpers from LazyHelp to Lazy?

[thejohnfreeman]

The historical convention has been to place static helper methods in their own final class with a private constructor. Static methods on interfaces is new in Java 8. This opens the possibility for putting helper methods directly on the interface they're for, eliminating the need for a separate class (with a longer name), but defies convention. Has this pattern emerged as a new convention (yet)? Should we adopt it?