auto install curl

Author: Stephen von Takach

.travis.yml

@@ -6,7 +6,7 @@ rvm:
   - jruby-20mode
 before_install:
   - sudo apt-get update -qq
-  - sudo apt-get install curl
+  - sudo apt-get install -y curl
   - sudo apt-get purge -y openssl libssl-dev
   - curl -o openssl.tar.gz https://www.openssl.org/source/openssl-1.0.2a.tar.gz
   - cd openssl