Merge branch 'release/1.2.0' into develop
Add file opening and closing to time measurement
Measure pure writing AND total. Do prettyprint
Fix cleanup
add options to set O_SYNC, O_DSYNC or O_DIRECT open flags.
make iowhip compile on OSX, as well.
update usage in README; fix little typo.
Merge remote-tracking branch 'akrennmair/develop' into develop (closes #1)
Version bump
Add CONTRIBUTORS
Correct LICENSE
Update CHANGELOG
Update README
Merge branch 'release/1.3.0'