-Add default to interface. Add fix for the test branch

-Change default behavior

.gitignore

@@ -33,3 +33,6 @@ hs_err_pid*
 /target/
 /Azure.Functions.Cli/*
 /azure-functions-java-worker/
+
+#IDE
+*.iml

build.ps1

@@ -19,7 +19,7 @@ $atchetypeVersion = $matches[1]
 Write-Host "atchetypeVersion: " $atchetypeVersion
 
 # Clone and install function maven plugin
-git clone https://github.com/Microsoft/azure-maven-plugins.git -b develop
+git clone https://github.com/Microsoft/azure-maven-plugins.git -b master
 Push-Location -Path "./azure-maven-plugins" -StackName libraryDir
 Write-Host "Build and install azure-functions-maven-plugins" 
 cmd.exe /c '.\..\mvnBuildSkipTests.bat'

src/main/java/com/microsoft/azure/functions/ExecutionContext.java

@@ -39,5 +39,7 @@ public interface ExecutionContext {
      * Returns the trace context.
      * @return the trace context
      */
-	TraceContext getTraceContext();
+	default TraceContext getTraceContext() {
+        return new TraceContext(){};
+    }
 }

src/main/java/com/microsoft/azure/functions/TraceContext.java

@@ -6,6 +6,7 @@
 
 package com.microsoft.azure.functions;
 
+import java.util.Collections;
 import java.util.Map;
 
 /**
@@ -19,17 +20,23 @@ public interface TraceContext {
      *
      * @return the TraceparentString from the Activity.
      */
-    String getTraceparent();
+    default String getTraceparent() {
+        return "";
+    }
 
     /**
      * Returns the Tracestate which is Activity.Current?.Id from host.
      * @return the Tracestate which is Activity.Current?.Id from host.
      */
-    String getTracestate();
+    default String getTracestate() {
+        return "";
+    }
 
     /**
      * Returns the attributes which correspond to the tags.
      * @return the attributes which correspond to the tags.
      */
-    Map<String, String> getAttributes();
-}
+    default Map<String, String> getAttributes() {
+        return Collections.<String, String>emptyMap();
+    }
+}