update standard graphs to achieve 0 pixel error
update Makefile
add missing spaces for stop() call
.gitignore
doh
suppress messages
move tests to tests/testthat
load stringr where it is necessary
use detailed reporter
more ignores
move bootstrapping code to helper_ file
remove most instances of testthat:::, require recent version
Merge branch 'master' into 18-test-error
query failure_msg instead of message, the latter doesn't seem to exist (anymore?)
pixel errors lead to test failure
tests now can run from within RStudio
remove unneeded
ignore files generated with tests [ci skip]
NEWS [ci skip]
Merge pull request #79 from yihui/18-test-error

Clean up tests, errors in images now make the tests fail.