Buffer.Word() fails if run on the last word in a buffer

[trapgate]

Buffer.Word() fails to expand the region if you run it on the last word in the buffer and there's no whitespace between the word and EOF. To reproduce:

1. Fire up lime
2. Create a new buffer with ctrl-n
3. Enter a word in the new buffer.
4. Double click to expand the selection to the whole word. This will fail - the selection will not expand, or may expand but not include the final character in the word.

If you add a trailing space or newline after the word, things will work as expected.

There's currently a workaround in the lime sources in transpose_test.go for this problem - when this is fixed the workaround (an extra newline in a buffer) can be removed.

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