Merge branch 'master' into feature/visibility

requirements.txt

@@ -1,17 +1,17 @@
 apipkg==1.4
-appdirs==1.4.2
+appdirs==1.4.3
 cocos2d==0.6.5
 coverage==4.4.2
-Dijkstar==2.2
+Dijkstar==2.3.0
 execnet==1.5.0
 freezegun==0.3.9
 packaging==16.8
-numpy==1.13.1
-psutil==5.4.0
-py==1.4.34
-pyglet==1.2.4
+numpy==1.13.3
+psutil==5.4.1
+py==1.5.2
+pyglet==1.3.0
 pyparsing==2.2.0
-pytest==3.2.3
+pytest==3.2.5
 pytest-cov==2.5.1
 pytest-timeout==1.2.0
 pytest-xdist==1.20.1