bump eventmachine to 1.0.1 for ruby 2.0.0 support.

eventmachine 1.0.0 does not work with ruby 2.0.0, this change gives kibana ruby 2.0.0 compatibility.
Merge pull request #312 from ankopainting/patch-1

bump eventmachine to 1.0.1 for ruby 2.0.0 support.