Test in all rubies, lets check if something fails

.travis.yml

@@ -1,6 +1,21 @@
 language: ruby
 services: mongodb
 rvm:
-  - 1.9.2
-  - 1.9.3
-#- jruby-19mode  JRuby in 1.9 mode pending
+  - jruby
+  - jruby-head
+branches:
+  only:
+    - master
+env:
+  - JRUBY_OPTS="--1.8 --server"
+  - JRUBY_OPTS="--1.9 --server"
+matrix:
+  include:
+    - rvm: 1.8.7
+      env: ''
+    - rvm: 1.9.2
+      env: ''
+    - rvm: 1.9.3
+      env: ''
+    - rvm: ruby-head
+      env: ''