Fix runfile argument parsing error by using shlex

[kapinga]

Changed sitecustomize.runfile() to parse arguments using shlex instead of string.split(). This allows users to run scripts with arguments containing escaped spaces in ipython.

Fixes #2010

[ccordoba12]

I'm fixing the tests in Appveyor. The failure is unrelated to your work.

Please don't do more merges with master :-)

[ccordoba12]

I think I fixed the errors in AppVeyor, so please merge again with master now :-)

[kapinga]

Sorry about that. I did another merge with master, but won't do that to you in future commits.

[ccordoba12]

@kapinga, don't worry about it, It's fine what you did. I just wanted to warn you so you wait me until I fixed our (irritating) AppVeyor issues :-)

We're very new in this business of continuous integration, so we are still fixing things here and there :-)

[ccordoba12]

@kapinga, could you merge with master again so that your PR gets some fixes to Travis and Appveyor I pushed yersterday?

Thanks :-)

[kapinga]

@ccordoba12 I merged with master again and everything seems to have checked out.

[ccordoba12]

@kapinga, thanks a lot for your patience and for your contribution!

Merging because this seems very useful ;-)