Merge branch 'v2.1rc2' into 'master'

Upgrade master to v2.1

Closes #16

See merge request !79
9 jobs for v2.1 in 6 minutes and 12 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #118321
VS2015
VS2015-32-bit

00:01:23

passed #118320
VS2015
VS2015-64-bit

00:01:31

passed #118319
VS2017
VS2017-32-bit

00:01:21

passed #118318
VS2015
VS2017-64-bit

00:01:30

passed #118315
Linux
clang-c++11

00:02:29

passed #118317
Linux
cppcheck

00:05:49

passed #118322
Linux
doc

00:00:05

passed #118314
Linux
gcc-c++11

00:04:26

passed #118316
Apple
macos-c++11

00:02:56