Refactor elastic-rest package for meteor

[frenchbread]

Research

• Go through ES & read the docs.

Refactor

• Allow providing configuration object as an additional parameter for ElasticRest() class e.g.:
• Add error handling.

var config = {
    "host": "es_host"
};

var options = {
    "index": "index_value",
    "type": "type_value",
    "limit": 100,
    "query": "query_object",
    "fields": "fields_array"
};

new ElasticRest(config, options);

Apinf

• Refactor getChartsData method to support updated API in elastic-rest package.

[frenchbread]

Updated meteor-elastic-rest package to v1.0.

Next, I'm going to create a separate branch to apply changes added to ElasticRest class API.

[frenchbread]

PR #678. Please review.