update examples with downloadable files

[steelec]

requested by reviewer, current examples are just examples of how it could be run rather than runnable examples.

1. update to runnable examples
2. compare results to saved results for validation of main function code changes.

[steelec]

initial notebook changes developed here.

• toy example based on one subject's data, 3 features
  • added randomization to generate multiple subjects for testing workflow and comparing between standard and simplified approaches

https://github.com/neuralabc/mvcomp/tree/fix-runnable_example1

[zklsmr]

updated the branch with 2 working examples example 2: 59564a81350335b1d449abf2fe19ea91ea0a6c46 example 3: 2f79c6268e54cdffaf247a0793404229bcd85b22

[steelec]

cleaned and updated with os.sep throughout for Windows e09cd9e7aa34691988ac6cb0fb5e785b883bc5ca

[steelec]

now functioning in https://github.com/neuralabc/mvcomp/tree/fix-runnable_example1

[steelec]

@zklsmr can you add markdown documentation and logical outlining to Examples 2 and 3? Please refer to the following for reference: https://github.com/neuralabc/mvcomp/blob/fix-runnable_example1/examples/Example1_Voxel-wise_D2_subj_to_group_MVComp.ipynb

[steelec]

completed in #16 , merged.