exclude build.log from Apache Rat check

Capturing maven output in a standard way fails because apache-rat detects the log file and fails the build because it does not contain a license. This fix excludes build.log from the apache-rat check ``` mvn -X clean install > build.log ```

exclude build.log from Apache Rat check
0b132342 · Aaron Niskode-Dossett · bbf98001 · 0b132342
Commit 0b132342 authored May 12, 2015 by Aaron Niskode-Dossett
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pom.xml pom.xml +1 -0

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--- a/pom.xml
+++ b/pom.xml
@@ -945,6 +945,7 @@
                        <exclude>**/maven-eclipse.xml</exclude>
                        <exclude>**/.externalToolBuilders/**</exclude>
                        <exclude>dashboard/**</exclude>
+                        <exclude>**/build.log</exclude>
                    </excludes>
                </configuration>
                <executions>