Mention environment variables mapping in the guide

 Closes gh-2234
Merge branch '1.1.x'
Remove unused code

Closes gh-2244
Merge branch '1.1.x'
Polish docs
Merge branch '1.1.x'
Polish appendix
Add docs for Spring Boot CLI via MacPorts

Add MacPorts section to reference docs since the Spring Boot CLI
is now also maintained in MacPorts.

Closes gh-2250
Merge pull request #2250 from breun/master

* pull2250:
  Add docs for Spring Boot CLI via MacPorts
fixed jetty9 MalformedURLException for Jar files