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/src/main/resources/application.yml

@@ -1,6 +1,3 @@
-logging:
-  level:
-   root: error
 spring:
   main:
     banner-mode: off
@@ -8,3 +5,15 @@ spring:
     command:
       completion:
         root-command: spring-shell-samples
+## disable console logging
+logging:
+  pattern:
+    console:
+## log debug from a cli
+#  file:
+#    name: shell.log
+#  level:
+#    root: debug
+#    org:
+#      springframework:
+#        shell: debug