Schema xml. Make id required attribute for 'metric'.
Fix metric aggregator

Revert default metric name
First docu commit
Refactor docs, create cross-references
modification to cross reference
minor changes in cross reference
Merge pull request #1 from dlatnikov/docs

minir changes in cross reference
Fix providers documentation
Refactor documentation for NotNullResponseValidator
Merge pull request #263 from kgribov/docs

Create docs for jagger main components
Merge pull request #244 from amikryukov/metric-id-attribute

Schema xml. Make id required attribute for 'metric'.
Merge pull request #248 from nmusienko/gd_master

Fix metric aggregator