Adding formatter support

Author: skuppa

src/main/java/org/springframework/data/rest/shell/formatter/FormatProvider.java

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+package org.springframework.data.rest.shell.formatter;
+
+public class FormatProvider {
+}

src/main/java/org/springframework/data/rest/shell/formatter/Formatter.java

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+package org.springframework.data.rest.shell.formatter;
+
+public interface Formatter {
+}

src/main/java/org/springframework/data/rest/shell/formatter/FormatterSupport.java

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+package org.springframework.data.rest.shell.formatter;
+
+public class FormatterSupport {
+}

src/main/java/org/springframework/data/rest/shell/formatter/NoOpFormatter.java

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+package org.springframework.data.rest.shell.formatter;
+
+public class NoOpFormatter {
+}

src/main/java/org/springframework/data/rest/shell/formatter/XmlFormatter.java

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+package org.springframework.data.rest.shell.formatter;
+
+public class XmlFormatter {
+}