Merge branch '32-boost-flags-are-not-propagated-to-tests' into 'master'

Resolve "BOOST flags are not propagated to tests"

Propagate BOOST_CPPFLAGS to tests

Closes #32

See merge request !15
6 jobs for 34-add-command-line-tools in 26 minutes and 43 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #1298
build:gcc:5

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passed #1299
build:gcc:6

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passed #1300
build:gcc:7

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passed #1301
build:gcc:8

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  Test
passed #1302
test:coverage

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72.3%
passed #1303
test:optimized

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