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
Added option to switch off colorization
Simplified 'use_colors'-related code
Added item on  to NEWS
Fixes in NEWS
Even more code simplification and doc update