function isSemVer( value ) {
	return ( isString( value ) && RE_SEMVER.test( value ) );
}
Tests if a value is a semantic version string.

@param {*} value - value to test
@returns {boolean} boolean indicating whether a provided value is a semantic version string

@example
var bool = isSemVer( '1.0.0' );
// returns true

@example
var bool = isSemVer( '1.0.0-alpha.1' );
// returns true

@example
var bool = isSemVer( '0.1' );
// returns false

@example
var bool = isSemVer( null );
// returns false