title: Unresolved Dependencies when building play 2.0 project
body: <p>Downloaded play-2.0 from type safe yesterday, following instructions as far as I can, but when I come to build with sbt I get unresolved dependency errors:</p>
  
  <blockquote>
    <p>[warn]    :: org.slf4j#slf4j-api;1.6.1: configuration not found in
    org.slf4j#slf4j-api;1.6.1: 'compile'. It was required from
    org.hibernate#hibernate-validator;4.2.0.Final compile [warn]  ::
    commons-codec#commons-codec;1.4: configuration not found in
    commons-codec#commons-codec;1.4: 'compile'. It was required from
    org.apache.httpcomponents#httpclient;4.1.2 compile [warn]
      :::::::::::::::::::::::::::::::::::::::::::::: [error]
    {file:/Users/george/work/play/gbraw/}gbraw/*:update:
    sbt.ResolveException: unresolved dependency:
    org.slf4j#slf4j-api;1.6.1: configuration not found in
    org.slf4j#slf4j-api;1.6.1: 'compile'. It was required from
    org.hibernate#hibernate-validator;4.2.0.Final compile [error]
    unresolved dependency: commons-codec#commons-codec;1.4: configuration
    not found in commons-codec#commons-codec;1.4: 'compile'. It was
    required from org.apache.httpcomponents#httpclient;4.1.2 compile</p>
  </blockquote>
  
  <p>I have deleted my .sbt directory (from an earlier install of sbt) but no joy. I'm sure I have something lying around that I shouldn't have but I'd appreciate any guidance on where to look...</p>
  
  <p>Thanks</p>