v0.3.1 - Githubissues

Mostly bug fixes for things that weren't caught in v0.3.0

Do the following before requesting a review

[x] I have written tests covering functions I have added or changed.
[x] I have run tests and they all pass.
[x] I have ensured all new functions will show up in the _pkgdown.yml file.
[x] I have updated DESCRIPTION with any new package dependencies.
[x] I have updated NEWS.md with a brief description of my changes.
[x] I have updated the package documentation with devtools::document().
[x] I have updated the package website with pkgdown::build_site_github_pages().