Add version command

- Add new styling system which works around concept that
  you use tags to request jline styles where tags comes
  from an activated theme.
- There is a default theme with options to add custom
  ones and change it via property.
- Add templating system which uses antlr stringtemplate which
  allows to write output with a template instead of manually
  crafting code.
- Add version command which integrates to Boot's BuildProperties
  and GitProperties. Only version field is visible on default
  and others can be enabled/disable via properties.
- Fixes #352
- Fixes #353

spring-shell-samples/pom.xml

@@ -19,6 +19,13 @@
 			<plugin>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-maven-plugin</artifactId>
+		        <executions>
+		          <execution>
+		            <goals>
+		              <goal>build-info</goal>
+		            </goals>
+		          </execution>
+		        </executions>
 			</plugin>
 		</plugins>
 	</build>