Fixed REST API documentation. Some values were not recognized as paramters by swagger script
Fixed a bug in the automatic retry collection, it does not show the prompt for the user to enter cluster credentials
Added generated swagger files
fixed JSON conversion
reallow attribute names starting with underscores
Merge branch 'devel' of https://github.com/triAGENS/ArangoDB into aql2

Conflicts:
	arangod/V8Server/v8-vocbase.cpp
prevent crashes
begun implementation of AggregateNode, not yet working
Merge branch 'aql2' of https://github.com/triAGENS/ArangoDB into aql2

Conflicts:
	arangod/Aql/ExecutionBlock.h
	arangod/Aql/ExecutionEngine.cpp