Add license terms file

[juhasch]

Initiated by #75, this adds a stripped version of the IPython license file.
@Carreau, @damianavila Comments ?

To the contributors to this repo:
@bjanssen
@davidovitch
@dbarbeau
@ibell
@kinverarity1

Do you agree to using the same license model (modified BSD license) as IPython for this repository ?

[dbarbeau]

It's ok for me!

[damianavila]

I agree on the license... we have to make sure to remove the headers from files too, and maybe replace them by:

# Copyright (c) IPython-contrib.
# Distributed under the terms of the Modified BSD License.

We also need to update the README to mention we are not officially related to IPython.
Just a group of developers and users committing independent extensions for the IPython project.

[Carreau]

Good idea. +1.

About legal/political issues , this also make me think that we should also maybe pre-discuss things like that, to avoid political conflict later. IPython contrib might be too small for that, but we might want to have an official policy in IPython itself.

[bjanssen]

I agree.

[damianavila]

@davidovitch, @ibell, @kinverarity1... could you comment on this issue? Thanks!!

[davidovitch]

Sorry for the late reply. Yes, I agree, and thanks for taking care of this.

[juhasch]

I think we can merge the license file now. The contributions from the people who have not respondend were improvements to documentation, not any code.
@Carreau It is difficult to know what an individual views as not appropriate. I think we should simply stick to what is widely accepted language.

[damianavila]

OK, merging...