Added step README-hacking's checklist to avoid merging dummy files

During the checklist we guide the user to delete the dummy `delete-me*'
files from their custom branch. Later, if the dummy files are updated in
the template's master branch, if the user merges with the template branch,
these files will be written back into their project! This is very annoying!

With this commit, a step was added in the `README-hacking.md' checklist,
just after deleting the dummy files to avoid this problem using the
`.gitattributes' file, telling Git to keep the changes as implemented in
the merging branch (`ours').

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