trim trailing whitespace

[jishnub]

Recursively removed trailing whitespace using perl -pi -e 's/ +$//' **/*.jl on zsh. There are no code changes, only whitespace ones.

[codecov]

Codecov Report

Merging #782 (f50f2f4) into master (af037cb) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #782   +/-   ##
=======================================
  Coverage   30.89%   30.89%           
=======================================
  Files          15       15           
  Lines         848      848           
=======================================
  Hits          262      262           
  Misses        586      586           

Impacted Files	Coverage Δ
src/Extras/autodifferentiation.jl	62.50% <ø> (ø)
src/ApproxFun.jl	50.00% <100.00%> (ø)

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