newContain newOneOf and atLeastOneOf

Added support of: 

newContain newOneOf 
newContain atLeastOneOf

majority of the tests are generated.

Beside the newContain, one changes that worth mentions is that I fixed a inconsistency in error message involving diff bracket in NotWord.scala:-

https://github.com/cheeseng/scalatest/commit/83f7fc77c95e57cc7e52292701c7eef2d8ff33ca#L2L610