Merge pull request #70 from jeff1evesque/doc_git_submodule

#68: Update 'Git Submodule' Subsection
Merge pull request #71 from jeff1evesque/doc_git_submodule

#68: README.md, remove 'Note' snippet
#72: README.md, add information regarding 'file permission'
#72: README.md, remove 'file permission' subsection
#72: README.md, minor language change
Merge pull request #73 from jeff1evesque/doc_git

#72: Documentation: Update 'GIT' Subsection
#68: README.md, mirror grammatical changes from 'Machine Learning'