Merge pull request #709 from kuba/go-1.5

Use Go 1.5.

.travis.yml

@@ -1,13 +1,18 @@
 language: python
 
+go:
+  - 1.5
+
 services:
   - rabbitmq
   - mysql
 
 # http://docs.travis-ci.com/user/ci-environment/#CI-environment-OS
+# gimme has to be kept in sync with Boulder's Go version setting in .travis.yml
 before_install:
   - travis_retry sudo ./bootstrap/ubuntu.sh
   - travis_retry sudo apt-get install --no-install-recommends nginx-light openssl
+  - '[ "xxx$BOULDER_INTEGRATION" = "xxx" ] || eval "$(gimme 1.5)"'
 
 # using separate envs with different TOXENVs creates 4x1 Travis build
 # matrix, which allows us to clearly distinguish which component under

docs/contributing.rst

@@ -67,7 +67,7 @@ The following tools are there to help you:
 Integration
 ~~~~~~~~~~~
 
-First, install `Go`_ 1.4 and start Boulder_, an ACME CA server::
+First, install `Go`_ 1.5 and start Boulder_, an ACME CA server::
 
   ./tests/boulder-start.sh