Roxygenize
Bump version to 0.5-1.5
Roxygenize
document temporary nature of .add.extension
enhance documentation
Merge pull request #124 from johnmyleswhite/document-add-extension

document temporary nature of .add.extension
Bump version to 0.5-1.6
Roxygenize
add NEWS item
reformat NEWS
Merge branch 'master' into full-test