Added dependency to gwt-material-table (Needed by Infinite Scroll)

Author: kevzlou7979

.travis.yml

@@ -17,6 +17,11 @@ before_install:
 - cd gwt-material
 - mvn install -DskipTests=true -DdryRun=true
 - cd ..
+# install the gwt-material-table library before we build the demo
+- git clone -b release_2.4.0 https://github.com/GwtMaterialDesign/gwt-material-table.git
+- cd gwt-material-table
+- mvn install -DskipTests=true -DdryRun=true
+- cd ..
 install: true
 before_script:
  - chmod +x .utility/*