Updated bedFile.cpp for better stdin support
Updated bedFile.cpp for better stdin support

	1.  Changed BedFile::loadBedFileIntoMapNoBin() to allow either "" or "stdin".
	2.  Consequently, this allows mergeBed to accept stdin as well.

jmarshall/bedtools2,arq5x/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,arq5x/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,arq5x/bedtools2,arq5x/bedtools2,arq5x/bedtools2