Merge pull request #8 from odolbeau/patch-1

Update log-command-status.php
Remove dependency on ES 0.90 from .travis.yml
Fix .travis.yml
Fixes for ES >=1.0, but wouldn't support 0.9 :(
Merge pull request #15 from wjzijderveld/fix-elasticsearch

Fix elasticsearch
Fix composer constraints
ID can be an object that implements __toString