First check-in of many for a code refactoring that will eventually:
1. Enable a common class for reading in all minctracc parameters. This should allow consolidation of some of the code in the LSQ6/12 and NLIN modules.
2. Have the ability to read in and adjust registration parameters for HierarchicalMinctracc and LSQ12ANTSNlin calls.

This check-in does the following:
1. Creates a new file (minc_parameters.py) and two new classes (setMincANTSParams and setMinctraccParams) which handle the logic of parameter setting from a specified .csv.
2. By virtue of creating the classes in 1, the logic for setting these parameters was deleted from the NLIN classes. NlinBase was also modified accordingly.

Addresses Issues #83 and #84.