Test Pull request from arwoll/pyspec

[arwoll]

Vicente:

This is a "test" pull request -- which is directed at your "develop" branch rather than "master" - in order for you to test it outside your master branch, though I notice your develop branch is a little behind master.

Note that the fork I am pulling from was created from your master branch, so accepting this pull request would include the changes you made between those branches.

I am not experienced at doing pull requests! So please let me know if I am doing something wrong or for any other reason you need to reject this request. that's OK!

This pull request incorporates two changes:

1. Changes the "python" subdirectory to "pyspec": For me, this change (along with a minor edit to setup.py) was necessary to make the github source installable on my mac.
2. Changes the motor_positions_list from a list to a dict, so that e.g. scan.motor_positions['motor1'] returns the motor value. This strikes me as the intended behavior. Instead, the prior version makes a list of tuples.

-Arthur