Use getmypid() if POSIX function isn't available
Merge tag '1.5.0' into develop

Version 1.5.0

- New: initial composer support
- New: DownloadLib (for use by Storyplayer)
Merge pull request #7 from darenc/develop

Use getmypid() if POSIX function isn't available
Version bump
Merge branch 'release/1.5.1'