proofreading 2014-10-29-Hello-World-in-Java.md

added missing words<br>
fixed spelling errors<br>
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you don't have to merge my pull request.<br>
this was just easier than me trying to explain my changes over IM.<br>
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Because some are hard to see, I'll highlight them here:<br>
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line 6: "dive head first into rabbit hole" vs "into the rabbit hole"<br>
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line 24: "Java fall apart and spit the ever-so-helpful NullPointerException" vs "Java fall apart and spit out the ever-so-helpful NullPointerException"<br>
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lines 31 and 37: spelling change<br>
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The rest you should see as highlighted below.