Update test-mutate.r
Update count.r

Changed test from `is.vector` to `is.atomic`, in order to fix Issue 130.
Update test-count.r

Added tests for passing factors and Dates to count.
Bug fix to #130
mapvalues: use warn_missing for factors. Fixes #180
Bump version to 1.8.0.99 for development
Re-document with roxygen2 3.0.0
Add tests for warn_missing with revalue and mapvalues
Convert to Rcpp
Update docs
Export loop_apply
Add rpoj file
Add travis support
Install testthat from github:
Use a couple of binary packages
Don't build travis file
Fix bug in id_var when factor levels missing
Ignore rhistory
Fix another problem with missing levels
Add build status to readme