Fix issues with travis cache

.travis.yml

@@ -35,6 +35,8 @@ before_install:
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then sudo gem install bundler; fi
 script:
   - if ! [ "$(ls -A vendor/v8/.git)" ] ; then rm -rf vendor/v8; fi
+  - rm -rf vendor/depot_tools
+  - git submodule update --init
   - MAKEFLAGS+=-j8 bundle exec rake spec binary --trace
 deploy:
   provider: releases
@@ -45,10 +47,13 @@ deploy:
   on:
     tags: true
     condition: $TRAVIS_OS_NAME = osx
+before_cache:
+  - cd vendor/v8 && git clean -xdf && git checkout .
+  - rm -rf vendor/depot_tools
 cache:
   bundler: true
   directories:
-    - vendor/v8/.git
+    - vendor
 notifications:
   recipients:
     - cowboyd@thefrontside.net