Added empty pages for all kinds of aggregations
Added percentile-ranks and marked unavailable aggregations
Started adding aggregation examples
Loads of Aggregation examples
Added more basic aggregation docs
Added rest of basic aggregation docs
Merge pull request #792 from andersosthus/feature/improve-docs

Adding Aggregation documentation
Merge branch 'develop' into feature/improve-docs
Rename folder new_docs -> docs
Merge branch 'develop' into feature/improve-docs
Merge branch 'develop' into feature/improve-docs
Update docs folder in gitignore
[Docs] Minor edits to introduction
[Docs] Minor edits to Contributing
[Docs] Minor edits to Quick Start
[Docs] Add EnableCompressedResponses option and other minor edits to Connecting
[Docs] Update Cluster failover options
[Docs] Add DisbableAutomaticProxyDetection, EnableMetrics, and ThrowOnElasticsearchServerExceptions options to Connecting
Minor edits to Building Requests
[Docs] Updates to Handling Responses