Distinguish error/warning in compilation-mode#174

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pnkfelix wants to merge 2 commits intorust-lang:masterfrom

pnkfelix:compilation-mode-distinguish-errors-and-warnings

Commits on Oct 5, 2016

Use naive multiline regexp to match message type and file:line:col spec in one step.
pnkfelix
committed

Commits on Dec 7, 2016

backup pattern for when we dont match the two lines properly.
pnkfelix
committed