fix (ngPluralize): generate a warning when being asked to use a rule tha...

[marclaval]

...t is not defined

Following discussions in #10207, it seems that the best solution is to use $log.debug as it is the only log level that can be disabled in production.

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[gkalpak]

BTW, I didn't get the impression that the "verdict" was to use debug() instead of warn().
I thought it was to use warn() and add support for setting the logging level in $logProvider 😄
@lgalfaso: So, what's the plan ?

[lgalfaso]

please also add watchRemover = noop;
also, it looks like the element text is not updated (it should be set to '')

[lgalfaso]

also, please check that the commit message follow the conventions (if you run init-repo.sh, the check is added)

[lgalfaso]

landed as c66b4b6