Provide an input validator function

semverValidate() returns false if a good semver cannot be created from the input

Warns about invalid input

Enhance (all) : Warns if invalid values

Signed-off-by: Martin H. Bramwell <martinhbramwell@gmail.com>

Apparently stable.

This has had a few eyes on it and there are no outstanding issues.

Fixed problem with extension comparison

Fix where only one input has special extension.

A semver having a special extension must be greater than a semver which does not.

Everything seems to be working

v0.1.0-beta.01

Allow dot (.) in alphanumeric suffix.  Bash only.