Add missing slash. Thanks to @bart1.
Closes #131
Update travis config
Implement auto_test_package with load_all.
 Fix bugs in safe_digest.
Closes #138. Closes #151. Closes #138. Closes #146
New way to create errorred expectations
R CMD check fixes
Remove roxygen from DESCRIPTION
Merge remote-tracking branch 'hadley/master' into 159-mocking