and add test for it so it won't happen again

Factor out dangerous input type in messages and normalize

when reporting an error during processing

instead of the hash we are trying to make
fixes #324

Always have tracker.config[:rails] by default

to avoid having to check for it

Avoid reporting duplicate symbol conversion warnings

Added --only-files option to specify specific paths to scan

Conflicts:
	test/tests/test_rails3.rb

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