Add Date.UTC to allowed capitalized functions

This commit changes the `new-cap` rule to allow the capitalized function `Date.UTC`.

The AST node is checked to see if the callee name is UTC and it is a member of object Date.

This fixes a problem where the `Date.UTC` function is flagged because it begins with a capital letter.

Fixes #1211
Merge pull request #1201 from dbrockman/new-cap-allow-utc

Add UTC to allowed capitalized functions