Incorporate tests from octave interval package.

[dpsanders]

Although these are gpl, it does not affect the license of VN.

[oheim]

I have published all test data under its original license (that is, Apache-2.0 or LGPL-2.1+ respectively):
https://github.com/oheim/ITF1788/tree/master/itl

[dpsanders]

Great, thanks!

[oheim]

Btw, could you have a look on my travis jobs? I have updated Julia to 0.6 and tried to use IntervalArithmetric.jl. I am seeing only errors. :-( Do I have to fix the plugin or is it an installation problem on travis?

ERROR: LoadError: LoadError: LoadError: too many parameters for type typealias
 in include_from_node1(::String) at ./loading.jl:532
 in include(::String) at ./sysimg.jl:14
 in include_from_node1(::String) at ./loading.jl:532
 in include(::String) at ./sysimg.jl:14
 in include_from_node1(::String) at ./loading.jl:532
 in include(::String) at ./sysimg.jl:14
 in anonymous at ./<missing>:2
 in eval(::Module, ::Any) at ./boot.jl:236
 in process_options(::Base.JLOptions) at ./client.jl:248
 in _start() at ./client.jl:335
while loading /home/travis/.julia/v0.6/IntervalArithmetic/src/multidim/intervalbox.jl, in expression starting on line 8
while loading /home/travis/.julia/v0.6/IntervalArithmetic/src/multidim/multidim.jl, in expression starting on line 1
while loading /home/travis/.julia/v0.6/IntervalArithmetic/src/IntervalArithmetic.jl, in expression starting on line 81

https://travis-ci.org/oheim/ITF1788/