Merge pull request #44 from jeff1evesque/doc_execution

#41: README.md, minor language change
Merge pull request #45 from jeff1evesque/doc_execution

#41: README.md, minor language change
#46: README.md, fix minor typos in 'Overview' subsection
Merge pull request #47 from jeff1evesque/doc_overview

#46: Fix minor typos in 'Overview' subsection
#48: input.txt, delete file
Merge pull request #49 from jeff1evesque/txt_input

#48: input.txt, delete file
#50: README.md, update 'Execution' subsection