removed coinor-cbc again and hopefully fixed glpk

.travis.yml

@@ -10,7 +10,7 @@ python:
   - "pypy"
 before_install: 
  - sudo apt-get update -qq
- - sudo apt-get install -qq glpk coinor-cbc
+ - sudo apt-get install -qq glpk
   #- pip install glpk
   #- sudo apt-get install coinor-cbc
 # command to install dependencies

src/pulp/tests.py

@@ -246,8 +246,7 @@ def pulpTest019(solver):
     prob += -y+z == 7, "c3"
     prob += w >= 0, "c4"
     print("\t Testing LpAffineExpression divide")
-    pulpTestCheck(prob, solver, [LpStatusOptimal], {x:4, y:-1, z:6, w:0},
-                    use_mps=False)
+    pulpTestCheck(prob, solver, [LpStatusOptimal], {x:4, y:-1, z:6, w:0})
 
 def pulpTest020(solver):
     # MIP