Fixes incorrect call in _add_mesh

[stefanoborini]

I suspect this is supposed to be add_edges...

[roigcarlo]

Indeed, copy paste error :(

[codecov-io]

Current coverage is 72.04% (diff: 100%)

Merging #318 into master will increase coverage by 0.19%

@@             master       #318   diff @@
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  Files           107        107          
  Lines          6795       6810    +15   
  Methods           0          0          
  Messages          0          0          
  Branches        803        806     +3   
==========================================
+ Hits           4882       4906    +24   
+ Misses         1873       1867     -6   
+ Partials         40         37     -3   

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[stefanoborini]

@roigcarlo which means that some tests are missing in there. I'll fix that, please don't merge.

[roigcarlo]

Sure, I am taking a look at it as well.

If I am not mistaken the test should be this one:

simphony-common/simphony/testing/abc_check_mesh.py

Lines 135 to 144 in 25e25f4

	def test_adding_and_getting_items(self):
	container = self.container
	# add items
	uids = self._add_items(container)
	# get items
	for index, expected in enumerate(self.item_list):
	self.assertEqual(
	self.get_operation(container, uids[index]), expected)

But for some reason is not running properly or is no using edges at all