Implement enumerable protocol #42
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resolves #38
This pull request implements the enumerable protocol for the HL7.Query struct, allowing us to use the enum module and the for-comprehension for processing selections.
The implementation works similarly to HL7.Query.map/2, in the sense that it transforms the traversed selections into an HL7.Query struct for further processing by passed functions. In fact, a call to HL7.Query.map/2 and Enum.map/2 should produce the same result.