Function has partly been taken from getForm function.
Generally, a feed query is a string built up as follows:
?&&...&
By specifying a feed url and parameter--value pairs (as list) we can easily
generate a feed query in R.
Usage
feedquery(url, params)
Arguments
url
character specifying feed url
params
list which contains feed parameters, e.g. list(param1="value1", param2="value2")