Add fetchSourceContext and fields definitions to GetDsl
Add cluster health query
Remove cache flags from parent/child filters

These are ignored in ES and no longer add the flags to the JSON
Add basic tests for cluster health
Merge pull request #94 from stringbean/cluster-health

Add basic cluster health request
Merge pull request #95 from stringbean/remove-parentchild-filter-cache

Remove cache flags from parent/child filters
Added DefinitionAttributeCutoffFrequency
#91 Marked jackson as optional
Merge pull request #90 from sksamuel/feature/source-and-fields-in-get-api

Add fetchSourceContext and fields definitions to GetDsl
#74 Opened builder for tests
Updated build.sbt for release 1.0.0.0.