Added 'make clean' to build steps
Merge pull request #166 from jwarwick/clean

Added 'make clean' to build steps
should be get_env/set_env instead of get_key/set_key
Merge pull request #167 from joshrotenberg/otp-doc-fix

should be get_env/set_env instead of get_key/set_key
Release v0.11.0
Improve text around version requirements