Blog updated

[Chintak Sheth]

Aah, great to find you on the scikit-image mailing list! I can certainly
learn a lot from you. =)

Coming to the aspect you pointed out, I was thinking if we could probably
get rid of `valid_template` all together from this evaluation and introduce
another einsum product of `ssd` with `valid_mask`?

For example, this is what we are doing,
`c*a**2 + c*b**2 - 2c*a*b`, which really is equivalent to `c*(a-b)**2`.

However, this does add another call to einsum. And I had performed tests
with about 500 pixels which amount to 1500 einsum calls. The bottleneck
turns out to be einsum calls.
(PR<https://github.com/scikit-image/scikit-image/pull/670>)
This is why I refrained from adding another einsum call, since I'd have
2000 calls then. However, your tests indicate that calls with 2 parameters
do run considerably faster, so may be I'll go ahead and make this change ?
What are your thoughts on this ?

Chintak
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