reduce travis testing matrix size

Author: mreinstein

.travis.yml

@@ -14,22 +14,14 @@ env:
 
 addons:
   sauce_connect: true
-  
+
 jobs:
   include:
-  - node_js: '6'
+  - node_js: '8'
     env: BROWSER_NAME=chrome BROWSER_VERSION=latest
-  - node_js: '6'
-    env: BROWSER_NAME=chrome BROWSER_VERSION=29
-  - node_js: '6'
+  - node_js: '8'
     env: BROWSER_NAME=firefox BROWSER_VERSION=latest
-  - node_js: '6'
+  - node_js: '8'
     env: BROWSER_NAME=safari BROWSER_VERSION=latest
-  - node_js: '6'
-    env: BROWSER_NAME=safari BROWSER_VERSION=7
-  - node_js: '6'
+  - node_js: '8'
     env: BROWSER_NAME=ie BROWSER_VERSION=11
-  - node_js: '6'
-    env: BROWSER_NAME=ie BROWSER_VERSION=10
-  - node_js: '6'
-    env: BROWSER_NAME=ie BROWSER_VERSION=9