Add process listener to analyze tools output

Issue: #4

plugin-dotnet-agent/src/main/kotlin/jetbrains/buildServer/dotnet/DotnetRunnerBuildService.kt

@@ -11,6 +11,7 @@ import jetbrains.buildServer.RunBuildException
 import jetbrains.buildServer.agent.ToolCannotBeFoundException
 import jetbrains.buildServer.agent.runner.*
 import jetbrains.buildServer.dotnet.dotnet.*
+import jetbrains.buildServer.dotnet.logger.DotnetLogger
 
 /**
  * Dotnet runner service.
@@ -53,4 +54,8 @@ class DotnetRunnerBuildService : BuildServiceAdapter() {
         val environment = DotnetUtils.updateEnvironment(environmentVariables)
         return SimpleProgramCommandLine(environment, workingDirectory.absolutePath, toolPath, arguments)
     }
+
+    override fun getListeners(): List<ProcessListener> {
+        return listOf<ProcessListener>(DotnetLogger(logger))
+    }
 }

plugin-dotnet-agent/src/main/kotlin/jetbrains/buildServer/dotnet/logger/DotnetLogger.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2000-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * See LICENSE in the project root for license information.
+ */
+
+package jetbrains.buildServer.dotnet.logger
+
+import jetbrains.buildServer.agent.BuildProgressLogger
+import jetbrains.buildServer.agent.runner.ProcessListenerAdapter
+
+/**
+ * .NET Core logger.
+ */
+open class DotnetLogger(private val myLogger: BuildProgressLogger) : ProcessListenerAdapter() {
+    override fun onStandardOutput(text: String) {
+        myLogger.message(text)
+    }
+
+    override fun onErrorOutput(text: String) {
+        myLogger.error(text)
+    }
+
+    override fun processFinished(exitCode: Int) {
+        super.processFinished(exitCode)
+    }
+}