avoid .toLowerCase() call in Buffer#write()

avoid .toLowerCase() call in Buffer#write()

Avoid a costly String#toLowerCase() call in Buffer#write() in the
common case, i.e., that the string is already lowercase.  Reduces
the running time of the following benchmark by about 40%:

for (var b = Buffer(1), i = 0; i < 25e6; ++i) b.write('x', 'ucs2');

From
https://github.com/iojs/io.js/commit/4ddd6406ce1c474e1a54a5aa9b56f755490
2fd10