corrected sql to select waterways w/ seasonal or intermittent tags [ref #105]


query now selects waterway that have intermittent=yes or seasonal=yes tag. 
Feel free to merge this; I'll make a new, separate branch to tweak the styling. Keep issue #105 open until the styling is added. 

yes is the value for 90% of seasonal=* tags; and 99% of intermittent=* tags. Query can be adjusted later on for other values if desired.