Started making additional changes for elementwise and scalar operations.
Incomplete.
Fixed dense elementwise and scalar operations.
Yale element-wise operations now in Ruby for easier customization.
Included __yale_map_merged_stored__ method in pure C. Still need Yale
map method for scalar computations.
Cleaned out some old elementwise op code, updated history
added diagonal fxn
Merge branch 'master' into lapack_svd

Conflicts:
	lib/nmatrix/nmatrix.rb