Small changes to docstrings

* Fix missing documentation of 'optimal' option for pick_ori
* Add reference for optimal orientation finding
* Add myself as author
Calculate lcmv solutions within a loop
Modify example for consistency and ease of viewing

* Make figures smaller for easy viewing on smaller screens and consistency with
  other examples
* Change colormap for consistency
* Activity plots now in a vertical alignment for consistency
* (also rename variable called boo...)
PEP8 fixes