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# Generic solution which checks that the MIME type starts with text/:
while IFS= read -r -d '' -u 9
do
    if [[ "$(file -bs --mime-type -- "$REPLY")" = text/* ]]
    then
        sed -i -e 's/[ \t]\+\(\r\?\)$/\1/' -- "$REPLY"
    else
        echo "Skipping $REPLY" >&2
    fi
done 9< <(find . -type f -print0)

find . -not \( -name .svn -prune -o -name .git -prune \) -type f -print0 | xargs -0 sed -i '' -E "s/[[:space:]]*$//"

# Git repository-specific solution 
# Source: http://unix.stackexchange.com/questions/36233/how-to-skip-file-in-sed-if-it-contains-regex/36240#36240
git grep -I --name-only -z -e '' | xargs -0 sed -i -e 's/[ \t]\+\(\r\?\)$/\1/'