Add numpy to requirements in setup.py

[will-moore]

Required for:

• BlitzGateway getTile(), createImageFromNumpySeq() etc
• webgateway: render_shape_mask() logger.error('No numpy installed')

Also required for parade and tests in omero-figure etc (see Travis failure at ome/omero-figure#354).

[will-moore]

Travis failing with:

test/unit/tablestest/test_servants.py:344 TestTables.testTableAddData

    def getHeaders(self, current=None):
>       rv = self.storage.cols(None, current)
E       AttributeError: 'NoneType' object has no attribute 'cols'
.tox/py37/lib/python3.7/site-packages/omero/tables.py:205: AttributeError

And:

test/unit/clitest/test_basics.py:70 TestBasics.testLoadGlob

FATAL: OMERODIR env variable not set

[manics]

Nitpick: How about keep these in alphabetical order?

[manics]

testLoadGlob should be fixed by #140
The tables error is a transient one.

[joshmoore]

Now green.

[will-moore]

Good to merge?

[joshmoore]

WFM