Bubble up test result messages.

src/main/kotlin/com/beust/kobalt/plugin/java/JavaCompiler.kt

@@ -94,11 +94,11 @@ class JavaCompiler @Inject constructor(val jvmCompiler: JvmCompiler, val kobaltL
                 }
 
             return if (result) {
-                    TaskResult(true, "Compilation succeeded")
+                    TaskResult(true, errorMessage = "Compilation succeeded")
                 } else {
                     val message = "Compilation errors, command:\n$command\n" + errorMessage
                     logk(1, message)
-                    TaskResult(false, message)
+                    TaskResult(false, errorMessage = message)
                 }
 
         }

src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinCompiler.kt

@@ -126,7 +126,7 @@ class KotlinCompiler @Inject constructor(
                 // The Kotlin compiler issues warnings on stderr :-(
                 containsErrors = { errors: List<String> -> errors.any { it.contains("rror")} }
             }).invoke()
-            return TaskResult(result == 0, "Error while compiling")
+            return TaskResult(result == 0, errorMessage = "Error while compiling")
         }
 
         private fun invokeCompilerDirectly(projectName: String, outputDir: String?, info: CompilerActionInfo,

src/main/kotlin/com/beust/kobalt/plugin/publish/BintrayApi.kt

@@ -204,7 +204,7 @@ class BintrayApi @Inject constructor(val http: Http,
                 return TaskResult()
             } else {
                 error(" Errors while uploading:\n" + errorMessages.map { "    $it" }.joinToString("\n"))
-                return TaskResult(false, errorMessages.joinToString("\n"))
+                return TaskResult(false, errorMessage = errorMessages.joinToString("\n"))
             }
         } else {
             warn("Found no artifacts to upload")

src/main/kotlin/com/beust/kobalt/plugin/publish/PublishPlugin.kt

@@ -153,7 +153,7 @@ class PublishPlugin @Inject constructor(val files: KFiles, val factory: PomGener
                 TaskResult()
             }
 
-        val result = TaskResult(tmpResult.success, messages.joinToString("\n  "))
+        val result = TaskResult(tmpResult.success, errorMessage = messages.joinToString("\n  "))
 
         return result
     }