URL Cleanup

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).

# HTTP URLs that Could Not Be Fixed
These URLs were unable to be fixed. Please review them to see if they can be manually resolved.

* [ ] http://jexcelapi.sourceforge.net (200) with 1 occurrences could not be migrated:
   ([https](https://jexcelapi.sourceforge.net) result AnnotatedConnectException).

# Fixed URLs

## Fixed But Review Recommended
These URLs were fixed, but the https status was not OK. However, the https status was the same as the http request or http redirected to an https URL, so they were migrated. Your review is recommended.

* [ ] http://progit.org/book/ch3-6.html (301) with 4 occurrences migrated to:
  https://progit.org/book/ch3-6.html ([https](https://progit.org/book/ch3-6.html) result SSLHandshakeException).
* [ ] http://progit.org/book/ch5-2.html (301) with 2 occurrences migrated to:
  https://progit.org/book/ch5-2.html ([https](https://progit.org/book/ch5-2.html) result SSLHandshakeException).
* [ ] http://book.git-scm.com/4_interactive_rebasing.html (301) with 1 occurrences migrated to:
  https://book.git-scm.com/4_interactive_rebasing.html ([https](https://book.git-scm.com/4_interactive_rebasing.html) result 404).
* [ ] http://help.github.com/send-pull-requests (404) with 2 occurrences migrated to:
  https://help.github.com/send-pull-requests ([https](https://help.github.com/send-pull-requests) result 404).

## 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 with 1 occurrences migrated to:
  https://maven.apache.org ([https](https://maven.apache.org) result 200).
* [ ] http://poi.apache.org with 1 occurrences migrated to:
  https://poi.apache.org ([https](https://poi.apache.org) result 200).
* [ ] http://projects.spring.io/spring-batch/ with 1 occurrences migrated to:
  https://projects.spring.io/spring-batch/ ([https](https://projects.spring.io/spring-batch/) result 200).
* [ ] http://spring.io/tools/sts with 1 occurrences migrated to:
  https://spring.io/tools/sts ([https](https://spring.io/tools/sts) result 200).
* [ ] http://stackoverflow.com/faq with 1 occurrences migrated to:
  https://stackoverflow.com/faq ([https](https://stackoverflow.com/faq) result 200).
* [ ] http://stackoverflow.com/questions/134882/undoing-a-git-rebase with 1 occurrences migrated to:
  https://stackoverflow.com/questions/134882/undoing-a-git-rebase ([https](https://stackoverflow.com/questions/134882/undoing-a-git-rebase) result 200).
* [ ] http://stackoverflow.com/questions/tagged/spring-batch with 1 occurrences migrated to:
  https://stackoverflow.com/questions/tagged/spring-batch ([https](https://stackoverflow.com/questions/tagged/spring-batch) result 200).
* [ ] http://docs.spring.io/spring-batch/reference/html/configureJob.html with 1 occurrences migrated to:
  https://docs.spring.io/spring-batch/reference/html/configureJob.html ([https](https://docs.spring.io/spring-batch/reference/html/configureJob.html) result 301).
* [ ] http://help.github.com/fork-a-repo/ with 2 occurrences migrated to:
  https://help.github.com/fork-a-repo/ ([https](https://help.github.com/fork-a-repo/) result 301).
* [ ] http://help.github.com/send-pull-requests/ with 2 occurrences migrated to:
  https://help.github.com/send-pull-requests/ ([https](https://help.github.com/send-pull-requests/) result 301).
* [ ] http://help.github.com/set-up-git-redirect with 1 occurrences migrated to:
  https://help.github.com/set-up-git-redirect ([https](https://help.github.com/set-up-git-redirect) result 301).

spring-batch-excel/README.md

@@ -4,7 +4,7 @@ Spring Batch extension which contains `ItemReader` implementations for Excel. Su
 
 ## Configuration
 
-Next to the [configuration of Spring Batch](http://docs.spring.io/spring-batch/reference/html/configureJob.html) one needs to configure the `ItemReader` for the desired framework.
+Next to the [configuration of Spring Batch](https://docs.spring.io/spring-batch/reference/html/configureJob.html) one needs to configure the `ItemReader` for the desired framework.
 There are 2 `ItemReaders` one can configure:
 
 - `org.springframework.batch.item.excel.jxl.JxlItemReader`
@@ -74,4 +74,4 @@ Uses a `BeanWrapper` to convert a given row into an object. Uses the column name
     </bean>
 
 [1]: http://jexcelapi.sourceforge.net
-[2]: http://poi.apache.org
+[2]: https://poi.apache.org