Travis CI add Percona MySQL 5.1 to the matrix

.travis.yml

@@ -67,6 +67,12 @@ matrix:
         mariadb: 10.2
         hosts:
           - mysql2gem.example.com
+    - rvm: 2.0.0
+      env: DB=mysql51
+      dist: precise
+      addons:
+        hosts:
+          - mysql2gem.example.com
     - rvm: 2.0.0
       env: DB=mysql55
       dist: precise
@@ -105,3 +111,6 @@ matrix:
     - os: osx
       rvm: system
       env: DB=mysql56
+    - rvm: 2.0.0
+      env: DB=mysql51
+      dist: precise

.travis_mysql51.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+set -eux
+
+apt-get purge -qq '^mysql*' '^libmysql*'
+rm -fr /etc/mysql
+rm -fr /var/lib/mysql
+apt-key adv --keyserver keys.gnupg.net --recv-keys 8507EFA5
+add-apt-repository 'deb http://repo.percona.com/apt precise main'
+apt-get update -qq
+apt-get install -qq percona-server-server-5.1 percona-server-client-5.1 libmysqlclient16-dev

.travis_setup.sh

@@ -2,6 +2,11 @@
 
 set -eux
 
+# Install MySQL 5.1 if DB=mysql51
+if [[ -n ${DB-} && x$DB =~ ^xmysql51 ]]; then
+  sudo bash .travis_mysql51.sh
+fi
+
 # Install MySQL 5.7 if DB=mysql57
 if [[ -n ${DB-} && x$DB =~ ^xmysql57 ]]; then
   sudo bash .travis_mysql57.sh