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Also added **simple** tests for backward and forward conversion.
In future versions we should add thorough tests.

Should close gsi-upm/senpy#31

* Added neutral point (if present)

Closes !gsi-upm/senpy#37 (Ian's)

I've added a neutral point definition (in the converters senpy file) as used in pull request #29

I've used euclidean metric instead of taxicab as I feel it makes more sense (taxicab has bizzare unintuitive effects for points far from the centroids).

Closes gsi-upm/senpy#34

Neutral is included as an 'origin' field. This is partly because emoml has no vocab for "Neutral" in dimensional models.

Closes #32

Closes #31

Merge branch 'patch-5' of https://github.com/drevicko/senpy into drevicko-patch-5

'25-validation-errors'
'27-add-method-to-get-list-of-plugins'
'28-fix-multiprocessing-issues'

Closes #28 for python 2.

Apparently, process pools are not contexts in python 2.7.
On the other hand, in py2 you cannot pickle instance methods, so
you have to implement Pool tasks as independent functions.

Closes #28

Added:

* Async test (still missing one that includes the IOLoop)
* Async plugin under tests. To manually try async functionalities:
```
senpy -f tests/
```

Closes #28

It turns out setting "plugins" as a @list in the context causes the
"plugins" property to expand to its full name.
Removing the type causes a regression of #17, which I initially missed
because the test in #17 was wrong.

Closes #26

Closes #26

There was no need to add @list, and it was causing JSON-LD to expand the
URI of 'plugins'

Closes #25

Does a weighted average of centroids.

If intensity sums to zero for a category, a 'neutral' category is used or 0 if it's not present. I'm not 100% sure this is the best approach, and the name of the "neutral" category perhaps should use some convention?

Note that if there are no categories present, then no VAD (or other dimensional) estimate is returned. It may be better to use the neutral centroid if it's present in this case also.

Closes #20