fix: E026 - 0,0 is invalid vehicle coordinate

[briandonahue]

Summary:

Addresses #77. 0,0 is invalid vehicle coordinate. Added check for vehicle location. Also updated UtilTest.java as it had a test with 0,0 as a valid coordinate. My understanding is it should be invalid here as well.

Expected behavior:

Vehicle location with 0,0 as a coordinate should throw E026

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[briandonahue]

I moved this test in the invalid test cases because it seems like 0,0 should be invalid according to #77 and this test broke when I changed the validator.