Address enhancement request #1322.
The overload is provided in `ranges` (original `fmt::join` exists
currently in `format.h` for historical reasons.
Tests for prvalue and lvalue tuple arguments as well as the empty
tuple are provided in `ranges-test.cc`.
* Add a _lot_ more warnings to FMT_PEDANTIC
Fix these warnings
* Add more compilers to CI
Fix (some) of the compiler errors with them
* Enable -Werror on CI
Increase warning level on MSVC when compiling with FMT_PEDANTIC
* Add VS 2013 and 2015 to Appveyor
* Fix Appveyor tests
Formatting
* Implement requested changes
Fix some of the MSVC warnings
Implement C++11 integer_sequence
* Reintroduce appveyor-build.py
* Remove ranges-test from tests
* Remove (some) explicit warning suppressions
Fix C++ standard setting in CI
* Remove (some) explicit warning suppressions
Fix C++ standard setting in CI
* Fix test builds with C++11
* Enable pedantic warnings on tests
* Fix warnings from edits to master
* Cleanups
* Add C++11 support to ranges.h
Re-enable ranges-test
Fix a Visual Studio error about function not returning a value in printf.h
Fix a bug in .travis.yml
