Conditional dependencies?

[sbromberger]

It seems strange to REQUIRE LightGraphs and Graphs when in all likelihood people will want to use this great package for either one or the other. Could I recommend something along the lines of what we do in LightGraphs for conditional dependencies?

try
    using LightGraphs
    nothing
catch
end

then you can have

if isdefined(:LightGraphs)
...

for the LG specific code, repeating for Graphs.jl as necessary.

[afternone]

Can we close this issue?