fix for building on ubuntu
Added untested yale scalar operation map_stored method
Merge pull request #113 from pickle27/master

fix for building on ubuntu
Merged ryanmt's diag() shortcut with a few changes. Fixes #115
updated documentation to point to the installation wiki page where appropriate
Merge branch 'master' of github.com:SciRuby/nmatrix
Yale scalar and elementwise operations. Fixes #38. Need to fix yale eqeq
still