fix for cases in which value_type is const double.
Silenced a warning
Minor updates to unit tests.
Expanded “Matrix-like” contract unit test. This test is currently failing.
Added a small unit test to catch a memory error bug.
Merge pull request #53 from evaleev/master

redesign of TensorView
resolves #57
Merge pull request #12 from BTAS/master

sync w BTAS/BTAS