Fix compiler bug with integral_constant as argument to index_sequence

Simon Praetoriusrequested to merge
issue/65-fix-integer-sequence-bug into releases/2.6

Summary

This bugfix solves an issue with std::make_index_sequence<SizeOf<T...>{}>;. For some reason (maybe a compiler bug) the argument SizeOf<T...>{} (an integral_constant) is not accepted by make_index_sequence. See the description of the error in the associated issue.

Note, this is a bugfix for the old release 2.6.

Closes #65 (closed)

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