URL Cleanup (#83)

This commit updates URLs to prefer the https protocol. Redirects are not followed to avoid accidentally expanding intentionally shortened URLs (i.e. if using a URL shortener).

# Fixed URLs

## Fixed Success 
These URLs were switched to an https URL with a 2xx status. While the status was successful, your review is still recommended.

* http://maven.apache.org/xsd/maven-4.0.0.xsd with 4 occurrences migrated to:  
  https://maven.apache.org/xsd/maven-4.0.0.xsd ([https](https://maven.apache.org/xsd/maven-4.0.0.xsd) result 200).
* http://projects.spring.io/spring-cloud/ with 2 occurrences migrated to:  
  https://projects.spring.io/spring-cloud/ ([https](https://projects.spring.io/spring-cloud/) result 200).
* http://stackoverflow.com/questions/1593051/how-to-programmatically-determine-the-current-checked-out-git-branch with 1 occurrences migrated to:  
  https://stackoverflow.com/questions/1593051/how-to-programmatically-determine-the-current-checked-out-git-branch ([https](https://stackoverflow.com/questions/1593051/how-to-programmatically-determine-the-current-checked-out-git-branch) result 200).
* http://stackoverflow.com/questions/29300806/a-bash-script-to-check-if-a-string-is-present-in-a-comma-separated-list-of-strin with 1 occurrences migrated to:  
  https://stackoverflow.com/questions/29300806/a-bash-script-to-check-if-a-string-is-present-in-a-comma-separated-list-of-strin ([https](https://stackoverflow.com/questions/29300806/a-bash-script-to-check-if-a-string-is-present-in-a-comma-separated-list-of-strin) result 200).
* http://www.apache.org/licenses/LICENSE-2.0 with 2 occurrences migrated to:  
  https://www.apache.org/licenses/LICENSE-2.0 ([https](https://www.apache.org/licenses/LICENSE-2.0) result 200).
* http://www.spring.io with 1 occurrences migrated to:  
  https://www.spring.io ([https](https://www.spring.io) result 301).
* http://repo.spring.io/milestone with 2 occurrences migrated to:  
  https://repo.spring.io/milestone ([https](https://repo.spring.io/milestone) result 302).
* http://repo.spring.io/release with 1 occurrences migrated to:  
  https://repo.spring.io/release ([https](https://repo.spring.io/release) result 302).
* http://repo.spring.io/snapshot with 2 occurrences migrated to:  
  https://repo.spring.io/snapshot ([https](https://repo.spring.io/snapshot) result 302).
* http://www.springsource.com/download/community with 1 occurrences migrated to:  
  https://www.springsource.com/download/community ([https](https://www.springsource.com/download/community) result 302).

# Ignored
These URLs were intentionally ignored.

* http://maven.apache.org/POM/4.0.0 with 8 occurrences
* http://www.w3.org/2001/XMLSchema-instance with 4 occurrences

mvnw.cmd

@@ -7,7 +7,7 @@
 @REM "License"); you may not use this file except in compliance
 @REM with the License.  You may obtain a copy of the License at
 @REM
-@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM    https://www.apache.org/licenses/LICENSE-2.0
 @REM
 @REM Unless required by applicable law or agreed to in writing,
 @REM software distributed under the License is distributed on an