Removed excess variable
Revert "Merged hamcrest-api into hamcrest-core."

This reverts commit 226e230454b348bbefddcf4c002726927201f7fb.
Reverted merging of API sources for now. Some warning tidy-up.
Tidying up string matchers. Removed IsBlankString
Tidying up string matchers. Removed IsEmptyString
Tidying up string matchers. All factory methods in MatchStrings