Optional support for multiple Git repos

This implementation adds multiple git repositories support to Spring Cloud Config Server.
By giving the following properties file:

info:
  component: Config Server
spring:
  application:
    name: configserver
  jmx:
    default_domain: cloud.config.server
  cloud:
    config:
      server:
        git:
          uri: https://github.com/spring-cloud-samples/config-repo
          repos:
            - patterns: iceycake-*
              uri: https://github.com/iceycake/config-repo
            - patterns: project1-*,*-project1
              uri: https://github.com/spring-cloud-samples/config-repo-1
with uri:

  /{application}/{profile}/{label}

where

spring.cloud.config.server.git.uri is the default git repository
spring.cloud.config.server.repos is a mapping between a git repository and
a string pattern that matches the {application} string in the endpoint.

Fixes gh-82, fixes gh-58

docs/src/main/asciidoc/quickstart.adoc

@@ -43,6 +43,29 @@ The YAML and properties forms are coalesced into a single
 map, even if the origin of the values (reflected in the
 "propertySources" of the "standard" form) has multiple sources.
 
+Spring Cloud Config Server also supports multiple git repositories:
+
+----
+spring:
+  cloud:
+    config:
+	  server:
+	    git:
+	      uri: https://github.com/spring-cloud-samples/config-repo
+	      repos:
+	        - patterns: *pattern
+	          uri: https://github.com/pattern1/config-repo
+	        - patterns: pattern*,*pattern1*
+	          uri: https://github.com/pattern2/config-repo
+	        - patterns: local*
+	          uri: file:/home/configsvc/config-repo
+----
+
+In the above example, if {application} does not match to any of the patterns
+under "spring.cloud.config.server.git.repos", it will use the default uri
+defined under "spring.cloud.config.server.git.uri".  Acceptable pattern
+format is "*xxx", "xxx*", or "*xxx*". 
+
 === Client Side Usage
 
 To use these features in an application, just build it as a Spring

docs/src/main/asciidoc/spring-cloud-config.adoc

@@ -85,6 +85,30 @@ working copy as a cache.
 This repository implementation maps the `{label}` parameter of the
 HTTP resource to a git label (commit id, branch name or tag).
 
+Spring Cloud Config Server also supports multiple git repositories:
+
+----
+spring:
+  cloud:
+    config:
+	  server:
+	    git:
+	      uri: https://github.com/spring-cloud-samples/config-repo
+	      repos:
+	        - patterns: *pattern
+	          uri: https://github.com/pattern1/config-repo
+            - patterns: pattern*,*pattern1*
+	          uri: https://github.com/pattern2/config-repo
+	        - patterns: local*
+	          uri: file:/home/configsvc/config-repo
+----
+
+In the above example, if {application} does not match to any of the patterns
+under "spring.cloud.config.server.git.repos", it will use the default uri
+defined under "spring.cloud.config.server.git.uri".  Acceptable pattern
+format is "*xxx", "xxx*", or "*xxx*". 
+
+
 ==== File System Backend
 
 There is also a "native" profile in the Config Server that doesn't use