chore(release): Bump version to v0.2.0+git
fix(build-release): Drop multi-OS support from build-release

Cross-compiling is broken, so the build-release script can
be simplified down to build just for the parent OS.
Merge pull request #301 from bcwaldon/update-build-release

fix(build-release): Drop multi-OS support from build-release
fix(fleetctl): make -v work for displaying versions