THRIFT-3421 rebar as dependency instead of bundling

This closes #693
diff --git a/build/travis/installDependencies.sh b/build/travis/installDependencies.sh
index 4945fd4..eab8c6b 100755
--- a/build/travis/installDependencies.sh
+++ b/build/travis/installDependencies.sh
@@ -43,7 +43,7 @@
 sudo apt-get install -qq libglib2.0-dev
 
 # Erlang dependencies
-sudo apt-get install -qq erlang-base erlang-eunit erlang-dev erlang-tools
+sudo apt-get install -qq erlang-base erlang-eunit erlang-dev erlang-tools rebar
 
 # GO dependencies
 echo "golang-go golang-go/dashboard boolean false" | debconf-set-selections