page with iframes for mockserver
render.json endpoint; iframes.json endpoint is removed
disallow zero dimensions for screenshots

getarg function was changed to use <= in one of the previous commits.
more tests for iframes; add an optional 'wait' GET parameter for setTimeout/setInterval handling
splash.defaults module
render.json in README
readme fix: mention that 'wait' should be in seconds.
move username/password to splash.defaults
Local cache support. See GH-6.
render.json: do not return HTML, PNG and iframes info by default
render.json examples in README
improve and fix test_wait (it used to check wrong things)
Merge pull request #13 from kmike/json-render-endpoint2

render.json endpoint