Changes to empty lines near bottom of file, for consistency

All BeardedSpice/*Strategy* files have one and only one line before the
last @end. This means some had it added, while others had them reduced
to one.
Remove trailing whitespace

All trailing whitespace was removed from all files. This is both from
otherwise empty lines (lines that have nothing but spaces) and lines
that have code but end with spaces.
Replaced tabs with spaces

All tabs were replaced with spaces, in all files.
Merge pull request #98 from vitorgalvao/fix-whitespace-lines

Fix whitespace lines