Switch to get/set methods
Fix ref{*} methods
Merge branch 'master' of github.com:HarlanH/DataFrames.jl into getset

Conflicts:
	src/dataarray.jl

Many other fixes: update for cor(), svd(), etc.
Added comment about double calls to using Stats
Merge pull request #213 from HarlanH/getset

Switch to get/set methods