Add fn strip-margin

[danielmiladinov]

Similar to String.stripMargin extension method in Scala; e.g.:

(require '[yang.lang :as yl])
=> nil

(println
  (yl/strip-margin "|<?xml version='1.0' encoding='utf-8'?>
                    |<people>
                    |  <person>
                    |    <name>Joe Smith</name>
                    |  </person>
                    |</people>"))
<?xml version='1.0' encoding='utf-8'?>
<people>
  <person>
    <name>Joe Smith</name>
  </person>
</people>
=> nil

Signed-off-by: Daniel Miladinov daniel.miladinov@gmail.com

[tolitius]

thanks for the PR!

[tolitius]

thank you!