Calls to tidyr and dplyr are now prefixed with package name. This lets us use the README as a test to make sure all namespace issues are fixed. We can roll this back when the package is more stable.

And change Long/Wide to lowercase to reflect that they are both variables names and a description of the state of the data.

Sets figure output to man/figures/tidyexplain- and ensures that all R chunks that output figures are named. This gives a collection of animations and static images with reasonable names ready for download and use.

modified union animation and added union_all