Attempt to fix deploy since it broke with net-ssh 3.0.1

Issue tracked here: https://github.com/travis-ci/travis-ci/issues/4635

.travis.yml

@@ -1,13 +1,12 @@
 sudo: true
-language: ruby
-rvm:
-  - 2.1.0
+language: c
 before_install:
 - sudo apt-get update -qq
 - sudo apt-get install -qq genisoimage liblzma-dev syslinux
 script:
 - "./script/prep-release.sh"
 before_deploy:
+- rvm 1.9.3 do gem install net-ssh -v 2.9.2
 - cd build
 deploy:
   provider: cloudfiles