v2.5.0

This is a minor release of dex with the following changes since v2.4.1:

Features:

• Bump golang version to 1.8.3 (#995, #994 )
• Google hosted domain support (#974)
• Updated docs (#989, #980, #972 )

Bug Fixes:

• Fix key rotation with multiple dex instances (#998)
• Avoid generating an invalid ID attribute in SAML's AuthenRequest element (#985)
• fix localhost redirect validation for public clients (#941)