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In particular:
1. Windows CR/LF weren't read properly (issue #11)
2. Scanning wasn't reading EOF properly
3. Documents may be empty (this was old, I think)
Also fixed some VS2008 warnings on /W4.

Switched to reading the entire file into a buffer at the start.\nThis speeds it up a TON (like 100x).

(Thanks to Vadim Zeitlin)

Added Read() functions for Node that return true/false, so we can easily check if a read is successful without throwing.
But we still have operator >> that throws on failure.

Added CMake scripts for other platforms\nFixed some bugs that gcc complained about\nFixed CR/LF vs LF bug

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Changed the public interface of Scanner to resemble an STL container.

Switched the Iterator implementation to a dedicated helper class  (to hide the specific implementation, since it's pretty messy and may change).

We were getting memory leaks (as told by the CRT detectors, which I also added), and there's really no reason (as long as we're careful) to use pointers there.

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