FLUME-713: Update Preconditions in EventImpl to provide actionable error messages

Review Request #1875 - Created July 20, 2011 and submitted

Jonathan Hsieh
old-flume
FLUME-713
flume
esammer, nerdynick
This problem was encountered by a user recently and multiple times in the past. 
compiles.  Ran TestEventImpl and it passes
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