Fix #22 GETs are made as POSTs
Allow Seq aswell as Map for query params

A Seq of 2tuples is a desired representation for queryparams, which
can't reliably be represented by a Map. Keys need not be unique in the
query params and they also have the property of being ordered, a
Seq[(KeyT, ValueT)] captures this.
Merge pull request #23 from ramn/master

Fix #22 GETs are made as POSTs