[ReactNative][Travis] Use nvm with node v0.10

.travis.yml

@@ -3,18 +3,26 @@ language: objective-c
 osx_image: beta-xcode6.3
 
 cache:
-  directories:
-  - node_modules
+    directories:
+        - node_modules
+        - .nvm
 
 before_install:
   - brew update
 install:
-  - brew reinstall flow xctool
+  - brew reinstall flow xctool nvm
+  - mkdir -p .nvm
+  - cp $(brew --prefix nvm)/nvm-exec .nvm/
+  - export NVM_DIR=.nvm
+  - source $(brew --prefix nvm)/nvm.sh
+  - nvm install v0.10
   - npm config set spin=false
   - npm install
 
 script:
 - |
+  nvm use v0.10
+
   if [ "$TEST_TYPE" = objc ]
   then