Always output the default header when saving ini file (99designs#476)

Add docs from 99designs#470

Improve naming and logging

Add -trimpath to builds for reproducability

Recognise more AWS env vars supported in the SDK

Fix linting issues

Fix exec

Simplify rotation

Merge pull request 99designs#440 from jstewmon/mfa-session-cache-key

fix: session cache key should vary with mfa serial

Sign dmg and add hardened runtime and timestamp to signature