Updating comments for the linter
Changing PreserveTimestamps option to PreserveModTime

so that it is more descriptive of the intent
Adding PreserveLinks: true to CpR to ensure its behavior doesn't change
Rearranging some files

putting copy functionality in its own and moving the package
documentation to its own as well, since there are now multiple source
files for the package
Fixing the gopath in the Makefile so it's only one path
Slightly simplifying Makefile
Merge pull request #6 from modcloth/minor-updates-to-copying-functionality

Minor updates to copying functionality