Drop deprecated dense computation of all the outer products in LMNN and its unit test
Modify ImpostorNode in LMNNImpl from class to struct
Better debug output in LMNN
Merge pull request #1358 from iglesias/feature/lmnn

Feature/lmnn
Merge pull request #1363 from van51/feature/modular

Added HashedDocDotFeatures in modular interfaces
Added HashedDocConverter to modular interfaces