Minor doc fix.
Merge pull request #1378 from pravsripad/doc_fixes

Minor doc fix.
Resolving path problem and making code pep8 compilant
Taking user defined path to create examples and MNE directory, excluding escape character, including examples case handling to consider the case where MNE exsists but examples doesnt
making it python 3.3 compitable by changing print to print()
trying to create examples, then MNE directory at home, if that fails exception is raised which tells user a possible solution
removing examples from MNE directory in home directory
Adding Space to highlight different branching and Adding space after #
changing MNE to MNE/mne_data
Improve error handling.
One data path to store them all.
Added backward compatibility and minor docs fix.
Added MNE_DATA variable to MEGSIM and EEGBCI. Also backward compatible.
misc
moving MEGSIM examples to datasets folder
misc
update mailmap
STY: raw.preload to match epochs
doc
fix docstring