Indexing is broken

[gragusa]

This is reproducible (on 0.4.0-dev+5252) (and generate problems with the indexing of DataFrames (see issue see issue #810:

da = @data([1, 2, NA, 4])
da[1:3]

ERROR: DimensionMismatch("index 1 has size (3,), but size(A) = ()")
 in checksize at multidimensional.jl:287
 in anonymous at /Users/gragusa/.julia/v0.4/Compat/src/ngenerate.jl:128
 in getindex at /Users/gragusa/.julia/v0.4/DataArrays/src/indexing.jl:159

I tracked down the issue to a misbehaviour of Base.index_shape

Base.index_shape(Base.to_index([1:2], [1])...)

gives

(1,)

instead of

(2,1)

[alyst]

I've also hit the issue. There's already a pull request #152 addressing this. Until it's merged to the master, you can just switch to that branch.