Merge pull request #67 from jeff1evesque/doc_git

#29: README.md, define 'GIT' subsection
#68: README.md, add 'GIT Submodule' subsection
Merge pull request #69 from jeff1evesque/doc_git_submodule

#68: README.md, add 'GIT Submodule' subsection
#68: README.md, update language
#68: README.md, minor change
#68: README.md, minor language change
#68: README.md, minor language change
Merge pull request #70 from jeff1evesque/doc_git_submodule

#68: Update 'Git Submodule' Subsection
#68: README.md, remove 'Note' snippet
Merge pull request #71 from jeff1evesque/doc_git_submodule

#68: README.md, remove 'Note' snippet
#72: README.md, add information regarding 'file permission'