Function getClosestIntegerKey

Gets the closest integer key to target in data.

• Requires map to have numbers as keys, not strings
• Math.round is used for rounding target.

Examples:

// Assuming numeric keys 1, 2, 3, 4 exist:
getClosestIntegerKey(map, 3);    // 3
getClosestIntegerKey(map, 3.1);  // 3
getClosestIntegerKey(map, 3.5);  // 4
getClosestIntegerKey(map, 3.6);  // 4
getClosestIntegerKey(map, 100);  // 4
getClosestIntegerKey(map, -100); // 1
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