Removed deprecated documentation of the comparison operator.

Travis aborts tests if they do not produce output for 10 minutes. This commit shall fix this.

Replace unicode whitespaces by ASCII whitespace 0x20

Code from https://stackoverflow.com/a/44503794/266378 which is hopefully working with MSVC.

Instead of calling CompatibleObjectType iterator-range constructor,
first convert json::value_type to CompatibleObjectType::value_type

This reverts commit c4ab8f82.

I totally forgot about byte order marks in this scenario.

Change the definition of the operator override of reverse iterator to using the result of the base class directly

operator>> now works as expected.