Document PromptProvider, ApplicationRunner and ConversionService.

Make the default ConversionService register converters in the ctx

spring-shell-samples/src/main/java/org/springframework/shell/samples/standard/ConversionExample.java

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+/*
+ * Copyright 2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.shell.samples.standard;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.shell.standard.ShellComponent;
+import org.springframework.shell.standard.ShellMethod;
+import org.springframework.stereotype.Component;
+
+@ShellComponent
+class ConversionCommands {
+
+	@ShellMethod("Shows conversion using Spring converter")
+	public Object conversionExample(DomainObject object) {
+		return object;
+	}
+
+}
+
+class DomainObject {
+	private final String value;
+
+	DomainObject(String value) {
+		this.value = value;
+	}
+}
+
+@Component
+class CustomDomainConverter implements Converter<String, DomainObject> {
+
+	@Override
+	public DomainObject convert(String source) {
+		return new DomainObject(source);
+	}
+}