[#3048] Don't drop 1.8.7 checking yet

Since it's backwards incompatible for older servers we don't want people
to think support is dropped.

Support will be dropped in fog 2.0 but we are still scheduling that!

.travis.yml

@@ -25,8 +25,6 @@ matrix:
       gemfile: Gemfile
 
   allow_failures:
-    - rvm: 1.8.7
-    - rvm: jruby-18mode
     - rvm: jruby-head
 
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