Fixed an error in "copy_r" method where I couldn't pass as a parameter a single file to be copied.
Created a method 'cp' that copies a single file.
Removed code from "cp_r" that copies a single file.
"cp_r" now uses the method "cp" to copy files
Added test to the new "cp" method
Debugging why Travis failed the tests
Testing why Travis failed the build
Debugging why Travis failed the tests
Merge commit '07c29dea157a2d5d5214367facb75736622e2f76' into dev