Fixed anyOf not validating when banUnknownProperties is true

[ahultgren]

This should fix #74 and #128. I just removed this line and the previous tests still pass and my quickly cobbled together test failed before and passes after the fix.

[travisperson]

@geraintluff Any reason this hasn't been merged?

[travisperson]

After digging into this patch, it appears it does not work. However, I believe what needs to happen is if errorAtEnd is false, we need to strip everything after startErrorCount. This will remove any errors reported after the loop continues through the rest of the array of possible object schemas.