Add libreactor as a travis-ci test dir

.travis.yml

@@ -15,6 +15,7 @@ env:
     #  find . -type d -depth 2 | sed 's|./|    - "TESTDIR=|' | sed 's/$/"/g'
     #
     #
+    - "TESTDIR=C/libreactor"
     - "TESTDIR=C/lwan"
     - "TESTDIR=C/duda"
     - "TESTDIR=C/haywire"