add setup.py + switch to pytest

* pytest: more modern and easy-to-use testing framework

setup.py

@@ -0,0 +1,7 @@
+from setuptools import setup
+
+setup(
+    name="Meshroom",
+    description="Photogrammetry Software",
+    requires=['psutil', 'pytest', 'pySide2', "pytest"]
+)

tests/test_task.py

@@ -1,5 +1,3 @@
-from nose.tools import *
-
 from meshroom import processGraph as pg
 
 
@@ -15,9 +13,9 @@ def test_depth():
         (tB.output, tC.input)
         )
 
-    assert_equal(tA.getDepth(), 1)
-    assert_equal(tB.getDepth(), 2)
-    assert_equal(tC.getDepth(), 3)
+    assert tA.getDepth() == 1
+    assert tB.getDepth() == 2
+    assert tC.getDepth() == 3
 
 
 if __name__ == '__main__':