fhircrackr 0.2.0

design for fhir_crack() has new form now:
1. has now named elements resource, cols, style (with style elements sep, brackets, rm_empty_cols)
2. old versions of design still work
new function fhir_canonical_design() returns the full (potentially automatically completed) design of the most recent call to fhir_crack()
argument add_indices of fhir_crack() is now deprecated, indices will be added when brackets is not NULL
new argument columns of fhir_rm_indices() gives control over the columns in which indices should be removed
new functions fhir_save_design() and fhir_load_design() for saving/loading design as xml-document
new function fhir_next_bundle_url() returns next-link of the last bundle processed by the most recent call to fhir_search()
new arguments save_to_disc and directory of fhir_search() allow for saving bundles consecutively as xml files instead of loading them into the R session all at once
Faster results of fhir_crack() because it now uses data.table internally
new argument data.table of fhir_crack to choose between data.frame vs. data.table as output format

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