fix(): update angular-material-build log directory to material2.

Author: hansl

.travis.yml

@@ -14,7 +14,7 @@ cache:
 
 env:
   global:
-  - LOGS_DIR=/tmp/angular-material-build/logs
+  - LOGS_DIR=/tmp/angular-material2-build/logs
   - SAUCE_USERNAME=angular-ci
   - SAUCE_ACCESS_KEY=9b988f434ff8-fbca-8aa4-4ae3-35442987
   - BROWSER_STACK_USERNAME=angularteam1