Since updating DataFrames and DataArrays recently, operators and basic
functions are not working on DataFrames anymore. Is this a new design
decision, or only temporary due to restructuring the code base?
julia> Pkg.status()
- DataFrames 0.5.1
- DataArrays 0.1.1
julia> df = DataFrame(rand(4, 2))
4x2 DataFrame
|-------|----------|----------|
| Row # | x1 | x2 |
| 1 | 0.698851 | 0.353054 |
| 2 | 0.427287 | 0.76353 |
| 3 | 0.872991 | 0.182744 |
| 4 | 0.779048 | 0.554823 |
julia> df + 1
ERROR: no method +(DataFrame, Int64)
julia> mean(df)
ERROR: no method +((ASCIIString,DataArray{Float64,1}),
(ASCIIString,DataArray{Float64,1}))
in mean at statistics.jl:11
julia> df + df
ERROR: no method +(DataFrame, DataFrame)
