Removed trailing whitespaces

In an effort to clean up the library's 2,663 `yogi lint` warnings, this will take care of 1,191 of them.  Too aggressive of an approach?  

FWIW, `yogi test` results are identical before & after.

Command: `find src/*/js/*.js -type f -print0 | xargs -0 sed -i '' -E "s/[[:space:]]*$//"`