check for scipy in init and interpolator

the grid refinement is only available if scipy is available.
maybe I should look for alternatives to correlate1d, but it runs so fast
with it...
add code to test data
bugfix --- correct yb generation for channel

I wonder why this didn't come up before...
introduce switches for different datasets

test_interp now has switches, and it will only test the datasets that
are requested.
bugfix --- actually use the nmax and mmax values

i.e. don't kill my computer trying to compute all the many neighbour
channel flow polynomials
add message at interpolate_spline start

since this can take a while, perhaps people would like to see some sign
that something is happening.
Merge branch 'issue#2' into develop
Merge branch 'bugfix-ascii_encoding' into develop
add example per issue#3

kind of minimalistic, but it's a start.
make examples dir

for now I'm moving just the ipython notebook, but I guess threshold will
be put here in the future, as well as the tests possibly.
update url to github/idies link
script to get turblib from github
change turblib ignore instructions
use turblib from github
issue#5 - place threshold.py in examples

also, uncomment the "free_threshold_array" from local_tools.c
like the issue says, maybe this should be something defined in turblib,
I'm not sure...
issue#5 --- remove get[...]Soap function names

if someone knows they exist, they should know how to modify this code
anyway. or they can ask for the options.
fix tox.ini misconfiguration

to be honest, I'm not really sure what this thing is actually doing, but
it's output is green now and there's a smiley face, so I can't really
complain.
change get[...]Soap calls in test.py
remove all traces of get[...]Soap
change getVelocitySoap to getVelocity in notebook