esper: added SchemaTranslator for getting event definitions
data: schema reference field to DataSource
data: DataManager notifies listeners about new schemata
test: added SchemaTranslatorTest
rest: moved OdsRestHook to rest package
data: DataChangeListener contains source id in onNewData
esper: added DataTranslator
esper: EsperManager sends data to engine
test: added DataSourceTest
data: DataSourceDb uses injection for DbAccessor
test: added DataSourceDbTest
test: added tests for utils

... copied from ods. Maybe create a utils jar and share?
esper: SchemaTranslator inserts classes into schema instead of strings

Simple strings does not work with nested maps.
test: added EsperManagerTest