Initial attempt to remove plotrix, pwr, and openintro dependencies.
Message, "please wait" when installing a package.
Merge branch 'master' into dependson
Roxygenized with klutometis/roxygen
cosmetic change.
Merge branch 'master' into dependson
different approach with loadDependencies()
small tweaks
remove browser() call
Changed lesson dependency code to use dependson.txt file in lesson directory.
removed url which was driving nick crazy
add warn=FALSE to readLines() to suppress EOL complaints
cosmetics
some on and off topic commits
update docs for install_from_swirl()
Merge pull request #112 from swirldev/dependson

Dependson