Moved activeOnly and accountId to **kwargs
No longer print params (debugging)
Fixed unset params
Merge pull request #31 from enStratus/server_kwargs

Updates to how we pass values into Server.all()
Attempts to parse date string from ES_ENDPOINT, validates, and uses if valid YYYY-MM-DD format.
Merge pull request #32 from enStratus/version_parse

Attempts to parse date string from ES_ENDPOINT instead of requiring ES_API_VERSION
Merge branch 'master' of github.com:enStratus/mixcoatl