Attempt to fix failing tests

.travis.yml

@@ -1,4 +1,11 @@
 sudo: required
 language: cpp
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - g++-4.8
+before_install: sudo apt-get -qq update
 install: ./install.sh
 script: ant test

install.sh

@@ -1,5 +1,4 @@
-sudo apt-get install libjsonrpccpp-dev libjsonrpccpp-tools libjsoncpp-dev
-brew install libjson-rpc-cpp
+sudo apt-get install libjsoncpp-dev
 cp lib/anttasks.jar ~
 pushd ~
 jar xf anttasks.jar