Don't fail R in Travis - runtime tests are failing in this environment

.travis.yml

@@ -63,6 +63,9 @@ matrix:
     - compiler: gcc
       env: SWIGLANG=tcl
   allow_failures:
+    # Lots of failing tests currently
+    - compiler: gcc
+      env: SWIGLANG=ocaml
     # Occasional gcc internal compiler error
     - compiler: gcc
       env: SWIGLANG=octave SWIGJOBS=-j3 VER=3.8
@@ -72,9 +75,9 @@ matrix:
     # Not quite working yet
     - compiler: gcc
       env: SWIGLANG=python SWIG_FEATURES=-O
-    # Lots of failing tests currently
+    # Runtime errors in Travis environment
     - compiler: gcc
-      env: SWIGLANG=ocaml
+      env: SWIGLANG=r
 before_install:
   - date -u
   - uname -a