(Pretty) print arrays with more than 3 dimensions

[compleconomics]

This probably relates to issue #27 of last month.

This
NamedArray(rand(Int16,2,4,2))
now looks fantastic in pretty printing.

However your fix may have broken the general (non-pretty) printing of >3-dimensional-arrays. So this
NamedArray(rand(Int16,2,4,2,4))
could still be assigned to a variable and sliced within 3 array dimensions, but any printing of more than 3 dimensions is not possible anymore at least on my system.

Specifically I get this error message:

NamedArray(rand(Int16,2,4,2,4))
2x4x2x4 Named Array{Int16,4}
[:, :, C=1, D=1] =
Error showing value of type NamedArrays.NamedArray{Int16,4,Array{Int16,4},Tuple{Dict{ASCIIString,Int64},Dict{ASCIIString,Int64},Dict{ASCIIString,Int64},Dict{ASCIIString,Int64}}}:
ERROR: MethodError: show has no method matching show(::Base.Terminals.TTYTerminal, ::Array{Int16,2}, ::Int64)
Closest candidates are:
show(::IO, ::NamedArrays.NamedArray{T,2,AT,DT}, ::Int64)
show(::IO, ::NamedArrays.NamedArray{T,1,AT,DT}, ::Int64)
show(::IO, ::AbstractArray{T,N})
...
in show at /Users/lh/.julia/v0.4/NamedArrays/src/show.jl:44
in writemime at /Users/lh/.julia/v0.4/NamedArrays/src/show.jl:21
in display at REPL.jl:114
in display at REPL.jl:117
[inlined code] from multimedia.jl:151
in display at multimedia.jl:163
in print_response at REPL.jl:134
in print_response at REPL.jl:121
in anonymous at REPL.jl:624
in run_interface at /Applications/Julia-0.4.6.app/Contents/Resources/julia/lib/julia/sys.dylib
in run_frontend at /Applications/Julia-0.4.6.app/Contents/Resources/julia/lib/julia/sys.dylib
in run_repl at /Applications/Julia-0.4.6.app/Contents/Resources/julia/lib/julia/sys.dylib
in _start at /Applications/Julia-0.4.6.app/Contents/Resources/julia/lib/julia/sys.dylib

[davidavdav]

This looks not good. I will have a look at it some time later.