Attempt to fix JsonCreator related bugs.

[nbauernfeind]

I believe that this should fix #229, #230, and #231. I was able to conclude that the test provided with 230 now passes.

I don't really understand why the test won't fail unless it's running inside of intellij.

[mbknor]

I'll test the "attempt to fix". Should I use 2.6.6-SNAPSHOT? Is this deployed to sonatype snapshot repo?

About "I don't really understand why the test won't fail unless it's running inside of intellij":
I do not think it is related to intelliJ, but Java 8.

[nbauernfeind]

2.6.5, 2.7.2 or either of the snapshots should work.

I know it seems like it's Java8 related but it's not. Even when I'm running in IntelliJ on 1.6 (i.e. it's clearly using /Library/Java/JavaVirtualMachines/1.6.0_65-b14-462.jdk/Contents/Home/bin/java) it is reproduced. No matter how I try to get tests to run from within SBT it does not fail this test (I've even removed the jvm target restrictions for tests only). However, if I run all tests in IntelliJ using JDK6 (or JDK8) only the CreatorTest was failing.