\dontrun{} some examples

The problem with this is when you run example() on these functions,
nothing will run now.  But they’ll all be skipped on CRAN, so we won’t
get complaints about example run times from them.

We can shorten them all further (is this even possible) and then
gradually remove \dontrun{}
See if tests work on travis' docker environment

http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-
infrastructure/

Might also try  cache: bundler?
Revert "See if tests work on travis' docker environment"

This reverts commit 37dafba37327e5169f93a8de667598d2e18c4454.
Merge pull request #126 from zachmayer/cran-review-part-2

\dontrun{} some examples