fix bind warning in todoApp example

[timotius02]

"Warning: bind(): React component methods may only be bound to the component instance." was popping up in both todoApp2 & todoApp3 because the "removeItem" onClick handlers were unnecessarily trying to bind to the component itself.

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[jwngr]

Thanks for the PR. I do see the warning now. I'll go ahead and merge this in once you sign the Google CLA.

Also, I see there are some extraneous console.log() messages in the removeItem() methods in both files. Would you mind removing them in this PR as well? Thanks!

[googlebot]

CLAs look good, thanks!

[timotius02]

Removed the console.logs. Not sure why the checks failed but hopefully it wasn't anything I did.
Edit: Nevermind it's fixed.

[jwngr]

Looks like Travis just had a hiccup. I re-ran it and things passed as expected. Thanks!