v1.0.0-beta8

• #66 - Query collection to remove. Fix #62 contributed by JimBobSquarePants
• #67 - Don't use readonly SpinLock. Fixes #63 #64 bug contributed by JimBobSquarePants
• #69 - Improve ImageSharpMiddleware no-op case's performance contributed by lahma
• #72 - Update remove extensions to handle implementation factories bug contributed by deanmarcussen
• #73 - Return on no commands enhancement contributed by JimBobSquarePants
• #74 - Better handle edge cases for determining updated source files enhancement contributed by JimBobSquarePants