Version 1.1.0

This is Version 1.1.0 of Itertools, a single-header library for adapting C++ ranges.

We thank all contributors: Daniel Bauernfeind, Alexander Hampel, Dylan Simon, Nils Wentzell

An itemized list of changes is provided in the [ChangeLog](https://github.com/TRIQS/itertools/blob/1.1.x/doc/ChangeLog.md).

Regenerate Apache copyright headers

Version 1.0.0

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Itertools Version 1.0.0 is a single-header
C++ library that allows, with a simple interface,
for the writing of various types of range-based for loops.

This is the initial release for this project.

itertools 1.0-rc1