botocore end points shouldn't be cached, because they don't update their IAM role credentials
Merge branch 'devel' of github.com:jlafon/PynamoDB into devel

* 'devel' of github.com:jlafon/PynamoDB:
  first pass at API docs. Fixed some docstring contents. Added links to functions from tutorial and indexes pages.
  import the actual version
  pep8 fixed
  link to the awscli docs for full credentials options
  make way for an api auto page
  bumped botocore requirement