EPE-74 Remove 1.7 Java Specific Feature

isAlphabetic is new in 1.7

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #125 from GordonSmith/EPE-74

EPE-74 Remove 1.7 Java Specific Feature

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>