Update README.md

Added external dependencies.
eliminated a subroutine that is never called
cleaned up comments
changed error output to display properly
Merge branch 'master' of http://github.com/vistalab/vistasoft
Merge pull request #45 from rfdougherty/master

Fixed a bug introduced yesterday
Added a check to ensure that the session has been updated.
Fixed the problem if keepFrames is not specified in the parameters.
Update to the session version code. Now leveraging mrVistaVersion to check if the migration occurred correctly.
Update to ensure that the rotation and perumuation needed to bring the sample volume into standard space is unambiguous
Merge pull request #44 from vistalab/fixSessionCheck

Added a check to ensure that the session has been updated.
Fixing an issue with the motion compensation code calling an old version of Select Scans that wasn't using 'viewGet'
Merge pull request #46 from vistalab/fixMotionComp

Updated SelectScans to use view Get
Fix a small issue where the keepFrames are not being calculated correctly. As well, roll-back a MATLAB suggested change to replace 'find' in a function.
Merge pull request #47 from vistalab/fixKeepFrames

Fix a small issue where the keepFrames are not being calculated correctl...
Fixing an issue with the motion comp using the wrong number of frames.
Fixed a minor issue with the motion compensation where the correct files were not being evaluated.
Fixed an issue with the calculation of total number of frames.
Merge pull request #48 from vistalab/fixMotComp

Fixing further issues with Motion Compensation
Adding a tag as well as adding Gray Coords to the parameter map field.