Lambda Ignore Properties and Generic Custom Comparers

Defect Fixes

• IgnoreOrder with Floats by @zhyy2008z https://github.com/GregFinzer/Compare-Net-Objects/issues/154
• Load Configuration Null Exception https://github.com/GregFinzer/Compare-Net-Objects/issues/158
• Ref Struct Exception https://github.com/GregFinzer/Compare-Net-Objects/issues/161

New Features:

• Lambda Ignore Properties by @ajepst. #153
• Generic type custom comparer from @goyzhang. #159