Device Guard Pilot 0.5.3

What's Changed

• Publish Pilot 0.5.2 signed update metadata by @ShalomMaman in #33
• Improve Device Guard project discoverability by @ShalomMaman in #35
• Fix Android 37 update scheduler launch crash by @ShalomMaman in #37
• Add a privacy-safe Device Guard product tour by @ShalomMaman in #39
• Automate protected pilot releases by @ShalomMaman in #42
• Prepare pilot 0.5.3 release by @ShalomMaman in #53
• Configure pilot signing before Android variants by @ShalomMaman in #54
• Verify pilot keystore before release builds by @ShalomMaman in #55
• Verify APK signers from certificate PEM by @ShalomMaman in #56

Full Changelog: pilot-v0.5.2...pilot-v0.5.3