Remove trailing whitespaces

[TamtamHero]

I produced this PR by running these commands I grabbed on SO (https://stackoverflow.com/a/5130044/5046689):

export LC_CTYPE=C
export LANG=C
find . -not \( -name .svn -prune -o -name .git -prune \) -type f -print0 | perl -0ne 'print if -T' | xargs -0 sed -Ei 's/[[:blank:]]+$//'

It would be great if you could run it from time to time :)

ps: btw, great job, thanks !

[tinchoabbate]

thanks for the suggestion, I'll take it into account for future versions.