Remove unused code

Remove code for unused algorithms (height two, height one laddered,
height n) and command-line i/o
Merge remote-tracking branch 'origin/develop'
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Merge pull request #7 from davghouse/develop

Develop
Merge pull request #8 from davghouse/master

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