Add: New parameter 'ignore-whitespace' to LongClass and LongMethod rules

Quite often you don't care about Comment Lines of Code nor whitespace when
counting the lines of code in a method.  The ignore-whitespace option allows you
to set these rules to ignore whitespace and only count the executable lines of
code.

This parameter defaults to `false` to avoid changing default behavior.
Merge pull request #122 from adambrett-forks/feature/improved-loc-rules

Add: New parameter 'ignore-whitespace' to LongClass and LongMethod rules