Fixed several bugs from the new file i/o setup.

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.

src/scanscalar.cpp

@@ -28,7 +28,7 @@ namespace YAML
 			// ********************************
 			// Phase #1: scan until line ending
 			while(!params.end.Matches(INPUT) && !Exp::Break.Matches(INPUT)) {
-				if(INPUT.peek() == EOF)
+				if(!INPUT)
 					break;
 
 				// document indicator?
@@ -60,7 +60,7 @@ namespace YAML
 			}
 
 			// eof? if we're looking to eat something, then we throw
-			if(INPUT.peek() == EOF) {
+			if(!INPUT) {
 				if(params.eatEnd)
 					throw ParserException(INPUT.line, INPUT.column, ErrorMsg::EOF_IN_SCALAR);
 				break;