Custom collection playground

Small examples of custom scala collections.

Various instructions

to work with this project :
- sbt ensimeConfig
  - Requires to have addSbtPlugin("org.ensime" % "sbt-ensime" % "0.5.0") in your sbt user config
  - command to run in atom : Ensime: Start
- sbt eclipse
  - Requires to have addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "4.0.0") in your sbt user config