(GH-73) Switch to puppetlabs/inifile from cprice/inifile

cprice/inifile is deprecated, this patch changes the module to use inifile's
new home puppetlabs/inifile.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #74 from kbarber/ticket/master/GH-73-cprice-inifile-deprecated

(GH-73) Switch to puppetlabs/inifile from cprice/inifile