IO and PKI fixes

Updated aws-c-io to v0.3.12, gets darwin/windows fixes (#61)

* Updated aws-c-io to v0.3.12, gets darwin/windows fixes

* Update travis config to use java language image and removed homebrew shenanigans

* Updated aws-c-io to get PKI fix

Removed ninja as a dependency

Convert CD pipeline to work on release tags (#58)

* Removed ninja as a dependency

* Use any version tag, not just annotated ones

Testing for deployment

v0.2.0

fix path to script

Initial release + Docs and simplified building

Added additional docs and removed non-maven manual steps from building

Initial release for Developer Preview

Initial release for Developer Preview, stabilized for the IoT Device SDK v2