Moved all of the C header enums into a C++ namespace, nm.

Implemented dense matrix reading and writing (full). Have not tested Yale yet, but the code is there. Dense symmetric/hermitian/skew/upper/lower is written but not working properly yet.
Merge branch 'master' of github.com:SciRuby/nmatrix
Version bump! 0.0.3
Added some unit tests in shortcuts_spec.rb (coverage 100%)
Fixed for gem release.
Merge pull request #57 from masaomi/AddUnitTests

Added some unit tests in shortcuts_spec.rb (coverage 100%)
Added some tests for nvector.rb, but some fail
Merge pull request #59 from masaomi/AddedUnitTests

Added some tests for nvector.rb, but some fail
Fixed exposed NMatrix::BLAS.gemv, issue #55.
Some spec updates, added friendly interface NMatrix::BLAS::rot