workaround ipython/ipython#6383
set isinteractive via the command line

Otherwise it looks like ~/.juliarc.jl will always be loaded too early
backwards compat
fix option passing
Merge pull request #230 from jkroso/fix/isinteractive

set isinteractive via the command line
Merge commit 'fd66b302b9625000a5abf179eb5cae32fa6041cb' into stdio