Added Fileprovider and CSVProvider
Refactored. Added support of new providers in schema.
Fix typo
removed "mixed" from type "object-creator-ref"
set attribute "path" as "required"
updated parent version
Merge remote-tracking branch 'grid/master' into new_providers

Conflicts:
	chassis/spring.schema/src/test/java/com/griddynamics/jagger/xml/JaggerConfigurationTest.java
Merge pull request #139 from nmusienko/new_providers

Added Fileprovider and CSVProvider