Add Python 2.7 and 3.6 to the testing and flake8 as well

Author: cclauss

circle.yml

@@ -1,3 +1,6 @@
+machine:
+  post:
+    - pyenv global 2.7.13 3.6.2
 general:
   branches:
     ignore:
@@ -7,8 +10,12 @@ general:
       - master
       - old_master
 test:
-    override:
-        - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
-        - flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-        - python -m unittest discover test_replays
-        - python -m unittest discover test_s2gs
+  override:
+    - python2.7 -m flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
+    - python2.7 -m flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - python2.7 -m python -m unittest discover test_replays
+    - python2.7 -m python -m unittest discover test_s2gs
+    - python3.6 -m flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
+    - python3.6 -m flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - python3.6 -m python -m unittest discover test_replays
+    - python3.6 -m python -m unittest discover test_s2gs