Negative number issue (2.13 branch - tests only)

[pjfanning]

Relates to #777 - these tests also fail in 2.13 branch but with a different issue.

com.fasterxml.jackson.core.JsonParseException: Unexpected character ('.' (code 46)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value
 at [Source: (StringReader); line: 1, column: 4]

	at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:2391)
	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:735)
	at com.fasterxml.jackson.core.base.ParserMinimalBase.reportUnexpectedNumberChar(ParserMinimalBase.java:557)
	at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._handleInvalidNumberStart(ReaderBasedJsonParser.java:1718)
	at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._parseNegNumber(ReaderBasedJsonParser.java:1467)
	at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:784)
	at com.fasterxml.jackson.failing.FailingNonStandardNumberParsingTest._testLeadingDotInNegativeDecimalAllowed(FailingNonStandardNumberParsingTest.java:37)
	at com.fasterxml.jackson.failing.FailingNonStandardNumberParsingTest.testLeadingDotInNegativeDecimalAllowedReader(FailingNonStandardNumberParsingTest.java:30)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at junit.framework.TestCase.runTest(TestCase.java:177)
	at junit.framework.TestCase.runBare(TestCase.java:142)
	at junit.framework.TestResult$1.protect(TestResult.java:122)
	at junit.framework.TestResult.runProtected(TestResult.java:142)
	at junit.framework.TestResult.run(TestResult.java:125)
	at junit.framework.TestCase.run(TestCase.java:130)
	at junit.framework.TestSuite.runTest(TestSuite.java:241)
	at junit.framework.TestSuite.run(TestSuite.java:236)

[cowtowncoder]

Sounds good. I am not sure if these are worth tackling for 2.13 but we can definitely add tests; will merge.