Update Gzip default settings

Enable CSS, JavaScript, etc. to be compressed.

Bump the version to 1.6.1

Add support for HSTS header

Stop prefixing redirect target with https:// unless necessary.

Also release 1.5.1

Bump version to 1.5.0

Change version number to 1.4.4

Fix an issue with underscore in domain and upstream

Also bumped the version to 1.4.3

Update version number to 1.4.2

Update the welcome message

Update the welcome message