Release Candidate for v1.1.0

[ndonald2]

@mgorbach @Raizlabs/maintainers-ios Please review this at your convenience. Coalesced a few new features into one release.

Changes

• Add support for keypaths in custom mappings
• Add capability to ignore keys/keypaths within a dictionary being imported
• Only log a warning for a missing mapping once per key/keypath per object

[alexrrouse]

@ndonald2 Code looks good to me, and updated on a project and works fine.

Love the new features btw, All three changes will come in very handy.

[ndonald2]

@arrouse Thanks! One more minor change - the cache for warnings logged was for the raw key name but it should be specific to the class.