upgraded com.google.guava and added dependency (#440)

Author: mbiarnes

ip-bom/pom.xml

@@ -288,6 +288,11 @@
         <artifactId>guava</artifactId>
         <version>${version.com.google.guava}</version>
       </dependency>
+      <dependency>
+        <groupId>com.google.guava</groupId>
+        <artifactId>guava-gwt</artifactId>
+        <version>${version.com.google.guava}</version>
+      </dependency>
 
       <dependency>
         <groupId>com.google.inject</groupId>

pom.xml

@@ -129,7 +129,7 @@
     <version.com.google.code.gin>1.0</version.com.google.code.gin>
     <version.com.google.code.gson>2.8.2</version.com.google.code.gson>
     <version.com.googlecode.gwt-crypto>2.3.0</version.com.googlecode.gwt-crypto>
-    <version.com.google.guava>20.0</version.com.google.guava>
+    <version.com.google.guava>25.0-jre</version.com.google.guava>
     <version.com.google.inject.guice>4.0</version.com.google.inject.guice>
     <version.com.google.gwt>2.8.2</version.com.google.gwt>
     <version.org.google.gwt-charts>0.9.9</version.org.google.gwt-charts>