[Merge] lp:~phablet-team/qt-halide/unit-tests into lp:qt-halide

[Ugo Riboni]

> 5) coverage does not work
> 
> kaleo at tequila:~/Projects/build-qt-halide-Desktop-Default$ make wipe-coverage
> && make check && make coverage-html
> make: *** No rule to make target 'wipe-coverage'.  Stop.

You need to build with -DCMAKE_BUILD_TYPE=coverage. I added this to the README.
(The code says so as well, but it is easy to overlook)
-- 
https://code.launchpad.net/~phablet-team/qt-halide/unit-tests/+merge/254064
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