Add window constraint, move arrow when needed #130
Merged
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I found that I needed to add the window constraint to the popover to keep the datepicker on-screen when there's not enough space below the input. I also implemented styles to move the arrow to the bottom of the datepicker when the popover moves above the input (should resolve #29).
Note that Tether does not currently reverse offsets when the window constraint triggers (see shipshapecode/tether#85): this means the arrow spacing will be inconsistent between the two states.