Added missing variable and quoted replacements

Saw `VAR_URL_HOOK` in `NEW_README.rst` and added it as an option.

The replacements weren't working for my app new app because the replacements weren't properly quoted. Not sure what part of my input values were wrong, but there shouldn't be any big issues with using double quotes.
Merge pull request #7 from gaqzi/patch-1

Added missing variable and quoted replacements