Fix issues with Android number input

[stevenday]

Android understands HTML5's <input type="number"> but only lets you put in integers. We need to do various decimal places all over the place, so we might need to do something with either jquery mobile or backbone forms (or both) to divide them into two inputs (there doesn't seem to be any other way to fix this).

[jdrever]

I found this too on test Android build (running on Samsung Galaxy s3, Android 4)- the Wetted Perimiter textbox does expect integers, but the Wet Water Depth & all further textboxes still expect text.