Minor fix.
Added varray comparison operators.
Merge branch 'master' of https://github.com/evaleev/BTAS into evaleev-master

Conflicts:
	btas/varray/memory_reference.h
Merge pull request #10 from evaleev/master

Range-based TWG spec and BTAS implementation of Range and Tensor
Added a missing #include.
Added dim() method to Range.
Merge pull request #11 from evaleev/master

sync with BTAS/BTAS
Merge pull request #3 from BTAS/master

sync with BTAS/BTAS