[PATCH] Split long lines in multi-line comments.

[Alexander Kornienko]

  Addressed djasper's comments, fixed bugs, added more tests. Now it correctly trims whitespace in broken lines and tries to handle looooong words that don't fit in one line correctly.

Hi djasper, klimek,

http://llvm-reviews.chandlerc.com/D547

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D547?vs=1302&id=1306#toc

Files:
  lib/Format/Format.cpp
  unittests/Format/FormatTest.cpp
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