Merge branch 'release/0.1'

* release/0.1: (30 commits)
  version bump
  PyYAML added as dependencies
  Update README.rst
  Update README.rst
  Update README.rst
  Update README.rst
  misc changes
  misc changes
  dynamodb support added
  fix the bug that did not send batch
  verify option added for SQS queue
  change the order of calling release_callback and final_callback, so that the request can matched with reponse
  send_batch implemented
  misc changes
  async keepalive client
  misc changes
  misc changes
  misc changes
  sign_post testcase
  sing_get testcase
  ...
Merge branch 'release/0.11'

* release/0.11:
  fix the version missing issue
  fix the VERSION.json
  misc changes
Merge branch 'release/0.12'

* release/0.12:
  version bumped
  change the service to dynamodb
  misc changes
  misc changes
  misc changes
  change "endpoint" to "region"
  misc changes
  misc changes
  misc changes
  misc changes
  start IamRoleV4Sign in ctor
  q_url
  adding req txt
  implementation of IamRoleApi
Merge branch 'release/0.13'

* release/0.13:
  version bumped
  Update README.rst
  misc changes
  proxy test in Make
  UT with proxy settings included
  UT for pycurl
retry when failed to get token
version bumped
Merge branch 'hotfix/0.13.1'

* hotfix/0.13.1:
  version bumped
  retry when failed to get token
experimental and very limited proxy support added
move the try block to the beging of start function, so it can capture all the error
version bumped and add upload to Makefile
Merge branch 'hotfix/0.13.2' into develop

* hotfix/0.13.2:
  version bumped and add upload to Makefile
  move the try block to the beging of start function, so it can capture all the error
  version bumped
  retry when failed to get token