Option to read records from a resource without connection options

[hariso]

We have two ways to write records: with or without ConnectionOptions/ResourceConfigs (going to be renamed in #105).

turbine-go/resource.go

Lines 5 to 6 in fb58a51

	Write(records Records, collection string) error
	WriteWithConfig(records Records, collection string, cfg ResourceConfigs) error

However, there's only one "flavor" of Records (used for reads), which is without ConnectionOptions/ResourceConfigs:

turbine-go/resource.go

Line 4 in fb58a51

Records(collection string, cfg ResourceConfigs) (Records, error)

If there are use cases for reading records using the default properties, i.e. without using ConnectionOptions/ResourceConfigs, then we should have that method too. That would make the methods in Resource more consistent too.