Add 2.1.x travis support

.travis.yml

+language: php
+
+php:
+  - 5.3
+  - 5.4
+env:
+  - DB=mysql
+  - DB=pgsql
+  - DB=sqlite
+
+before_script:
+  - sh -c "if [ '$DB' = 'pgsql' ]; then psql -c 'DROP DATABASE IF EXISTS doctrine_tests;' -U postgres; fi"
+  - sh -c "if [ '$DB' = 'pgsql' ]; then psql -c 'DROP DATABASE IF EXISTS doctrine_tests_tmp;' -U postgres; fi"
+  - sh -c "if [ '$DB' = 'pgsql' ]; then psql -c 'create database doctrine_tests;' -U postgres; fi"
+  - sh -c "if [ '$DB' = 'pgsql' ]; then psql -c 'create database doctrine_tests_tmp;' -U postgres; fi"
+  - sh -c "if [ '$DB' = 'mysql' ]; then mysql -e 'create database IF NOT EXISTS doctrine_tests_tmp;create database IF NOT EXISTS doctrine_tests;'; fi"
+  - git submodule update --init
+
+script: phpunit --configuration tests/travis/$DB.travis.xml
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tests/travis/mysql.travis.xml

+<?xml version="1.0" encoding="utf-8"?>
+<phpunit>
+    <php>
+        <var name="db_type" value="pdo_mysql"/>
+        <var name="db_host" value="localhost" />
+        <var name="db_username" value="travis" />
+        <var name="db_password" value="" />
+        <var name="db_name" value="doctrine_tests" />
+        <var name="db_port" value="3306"/>
+
+        <var name="tmpdb_type" value="pdo_mysql"/>
+        <var name="tmpdb_host" value="localhost" />
+        <var name="tmpdb_username" value="travis" />
+        <var name="tmpdb_password" value="" />
+        <var name="tmpdb_name" value="doctrine_tests_tmp" />
+        <var name="tmpdb_port" value="3306"/>
+    </php>
+
+    <testsuites>
+        <testsuite name="Doctrine Test Suite">
+            <directory>./../Doctrine/Tests</directory>
+        </testsuite>
+    </testsuites>
+    <groups>
+        <exclude>
+            <group>performance</group>
+            <group>locking_functional</group>
+        </exclude>
+    </groups>
+
+</phpunit>
+

tests/travis/pgsql.travis.xml

+<?xml version="1.0" encoding="utf-8"?>
+<phpunit>
+    <php>
+        <var name="db_type" value="pdo_pgsql"/>
+        <var name="db_host" value="localhost" />
+        <var name="db_username" value="postgres" />
+        <var name="db_password" value="" />
+        <var name="db_name" value="doctrine_tests" />
+        <var name="db_port" value="5432"/>
+
+        <var name="tmpdb_type" value="pdo_pgsql"/>
+        <var name="tmpdb_host" value="localhost" />
+        <var name="tmpdb_username" value="postgres" />
+        <var name="tmpdb_password" value="" />
+        <var name="tmpdb_name" value="doctrine_tests_tmp" />
+        <var name="tmpdb_port" value="5432"/>
+    </php>
+    <testsuites>
+        <testsuite name="Doctrine Test Suite">
+            <directory>./../Doctrine/Tests</directory>
+        </testsuite>
+    </testsuites>
+    <groups>
+        <exclude>
+            <group>performance</group>
+            <group>locking_functional</group>
+        </exclude>
+    </groups>
+</phpunit>
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tests/travis/sqlite.travis.xml

+<?xml version="1.0" encoding="utf-8"?>
+<phpunit>
+    <testsuites>
+        <testsuite name="Doctrine Test Suite">
+            <directory>./../Doctrine/Tests</directory>
+        </testsuite>
+    </testsuites>
+    <groups>
+        <exclude>
+            <group>performance</group>
+            <group>locking_functional</group>
+        </exclude>
+    </groups>
+</phpunit>
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