Count and between 2 dates request case

[ghost]

Currently it would seem that in case of a count the elements are randomized. It could be contemplated the case in which you want a list of elements between 2 dates.

Related to #71

Example
https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY&start_date=2014-10-01&end_date=2014-10-03&count=2

Response

{"code":400,"msg":"Bad Request: invalid field combination passed. Allowed request fields for apod method are 'concept_tags', 'date', 'hd', 'count', 'start_date', 'end_date', 'thumbs'","service_version":"v1"}

apod-api/application.py

Lines 275 to 276 in d392c15

	elif not input_date and not start_date and not end_date and count:
	return _get_json_for_random_dates(int(count), use_concept_tags, thumbs)

apod-api/application.py

Lines 150 to 180 in d392c15

	def _get_json_for_random_dates(count, use_concept_tags, thumbs):
	"""
	This returns the JSON data for a set of randomly chosen dates. The number of dates is specified by the count
	parameter
	:param count:
	:param use_concept_tags:
	:return:
	"""
	if count > 100 or count <= 0:
	raise ValueError('Count must be positive and cannot exceed 100')
	begin_ordinal = datetime(1995, 6, 16).toordinal()
	today_ordinal = datetime.today().toordinal()
	random_date_ordinals = list(range(begin_ordinal, today_ordinal + 1))
	shuffle(random_date_ordinals)
	all_data = []
	for date_ordinal in random_date_ordinals:
	dt = date.fromordinal(date_ordinal)
	data = _apod_handler(dt, use_concept_tags, date_ordinal == today_ordinal, thumbs)
	# Handle case where no data is available
	if not data:
	continue
	data['service_version'] = SERVICE_VERSION
	all_data.append(data)
	if len(all_data) >= count:
	break
	return jsonify(all_data)