Support transformation to and from Java primitives

[MateuszKubuszok]

chimney-java-collections could have a few more implicits to handle:

• support transformation scala.Boolean to/from java.lang.Boolean
• support transformation scala.Byte to/from java.lang.Byte
• support transformation scala.Char to/from java.lang.Char
• support transformation scala.Int to/from java.lang.Integer
• support transformation scala.Long to/from java.lang.Long
• support transformation scala.Short to/from java.lang.Short
• support transformation scala.Float to/from java.lang.Float
• support transformation scala.Double to/from java.lang.Double
• support transformation scala.Double to/from java.lang.Double

It could be really simple to implement with just 2 Transformers as implicit vals for each bulletpoint, test for each such transformation and note in docs.