Get top trading pairs by 24 hour aggregated volume for a currency.
	
	Args:
		fsym: FROM symbol.
		limit: Number of results. Default value returns top 5 pairs.
	
	Returns:
		Function returns a list containing a dictionary for each result:

		[{'exchange': ..., 'fromSymbol': ..., 'toSymbol': ..., 'volume24h': ..., 
		  'volume24hTo': ...}, 
 		 {...}, 
 		 ...]

		The list is ordered based on the volume of the FROM currency starting 
		with the highest value.

def get_top_pairs(fsym, limit=5):
	"""Get top trading pairs by 24 hour aggregated volume for a currency.
	
	Args:
		fsym: FROM symbol.
		limit: Number of results. Default value returns top 5 pairs.
	
	Returns:
		Function returns a list containing a dictionary for each result:

		[{'exchange': ..., 'fromSymbol': ..., 'toSymbol': ..., 'volume24h': ..., 
		  'volume24hTo': ...}, 
 		 {...}, 
 		 ...]

		The list is ordered based on the volume of the FROM currency starting 
		with the highest value.
	"""

	# load data
	url = build_url('pairs', fsym=fsym, limit=limit)
	data = load_data(url)

	return data['Data']