Adding UTF-8 BOM to string/Blob

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Prepend \ufeff to the string. See http://msdn.microsoft.com/en-us/library/ie/2yfce773(v=vs.94).aspx

See discussion between @jeff-fischer and @casey for details on UTF-8 and UTF-16 and the BOM. What actually makes the above work is that the string \ufeff is always used to represent the BOM, regardless of UTF-8 or UTF-16 being used.

See p.36 in The Unicode Standard 5.0, Chapter 2 for a detailed explanation. A quote from that page

The endian order entry for UTF-8 in Table 2-4 is marked N/A because
UTF-8 code units are 8 bits in size, and the usual machine issues of
endian order for larger code units do not apply. The serialized order
of the bytes must not depart from the order defined by the UTF- 8
encoding form. Use of a BOM is neither required nor recommended for
UTF-8, but may be encountered in contexts where UTF-8 data is
converted from other encoding forms that use a BOM or where the BOM is
used as a UTF-8 signature.

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