Freshen up indexing.jl.
Merge branch 'master' of git://github.com/HarlanH/DataFrames.jl
More indexing.jl tweaks.
Merge branch 'master' of git://github.com/HarlanH/DataFrames.jl
Add tests for IndexedVector.
Merge branch 'master' of git://github.com/HarlanH/DataFrames.jl