Add Color.jl as a dependency

[Carreau]

Not sure to what.. maybe an "REPL" package issue:

ERROR: could not open file /Users/bussonniermatthias/julia/Color.jl
 in include_from_node1 at loading.jl:92
 in reload_path at loading.jl:117
 in require at loading.jl:48
 in include_from_node1 at loading.jl:92
 in reload_path at loading.jl:117
 in require at loading.jl:48
 in include_from_node1 at loading.jl:92
 in reload_path at loading.jl:117
 in require at loading.jl:48
 in include_from_node1 at loading.jl:92 (repeats 2 times)
 in process_options at client.jl:274
 in _start at client.jl:352
at /Users/bussonniermatthias/.julia/Terminals/src/Terminals.jl:140
at /Users/bussonniermatthias/.julia/REPL/src/REPL.jl:108
at /Users/bussonniermatthias/IJulia.jl/src/IJulia.jl:12
at /Users/bussonniermatthias/IJulia.jl/src/kernel.jl:3

solved by Pkg2.add("Color") ...

[stevengj]

Looks like a REPL issue; please file it there. (But I'd like to circumvent this whole problem by Keno/REPL.jl#4)