travis/appveyor: using pip inside ci.py to install py2/py3 mbuild

Change-Id: I057cb212dedd7d8b22866d85de8afc025383e00a

.travis.yml

@@ -16,5 +16,4 @@ matrix:
       os: osx
 
 script:
-    - pip install --user https://github.com/intelxed/mbuild/zipball/master
     - python ci.py

appveyor.yml

@@ -1,5 +1,4 @@
 build: off
 
 test_script:
-    - pip install --user https://github.com/intelxed/mbuild/zipball/master
     - python ci.py

ci.py

@@ -5,16 +5,16 @@
 def get_python_cmds():
     if platform.system() == 'Windows':
         lst = []
-        #pyvers = ['27','35']
-        pyvers = ['27']
+        pyvers = ['27','35']
+        #pyvers = ['27']
         for pyver in pyvers:
             pycmd = 'C:/python{}/python'.format(pyver)
             lst.append((pyver,pycmd))
         return lst
     elif platform.system() == 'Linux':
         lst = []
-        #pyvers = ['2.7','3.5.2']
-        pyvers = ['2.7']
+        pyvers = ['2.7','3.5.2']
+        #pyvers = ['2.7']
         for pyver in pyvers:
             pycmd = '/opt/python/{}/bin/python'.format(pyver)
             lst.append((pyver,pycmd))
@@ -24,6 +24,9 @@ def get_python_cmds():
 
 
 for pyver,pycmd in get_python_cmds():
+    cmd = '{} -m pip install --user https://github.com/intelxed/mbuild/zipball/master'.format(pycmd)
+    print(cmd)
+    subprocess.check_call(cmd, shell=True)
     for size in ['ia32','x86-64']:
         for linkkind,link in [('dfltlink',''),('dynamic','--shared')]:
             build_dir = '{}-{}-{}'.format(pyver, size, linkkind)