Regex based applicability detection

[nuest]

Right now, the detection whether a transformer is suitable for a given document is based on XPath only. This severly limits transformers to only support XML input documents. Example:

{
   "transformationDescription":{
      "name":"transformerSML10",
      "applicabilityPath":"boolean(//*[local-name()='SensorML'][@version='1.0.1'])",

A new property should be added to the transformationDescription called applicabilityRegex, which contains a regex to be compiled in Java (http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html) to match the input document. This would also allow simple string comparison, and also a "matches everything" configuration:

{
   "transformationDescription":{
      "name":"transformerMySensorDoc",
      "applicabilityRegex":"<SensorML>*<System>",

Implementation steps:

• Add method TransformationDescription.isApplicable()
• use that method within updateGeoLabel()
• Add tests and demo for string-based applicabiilty configuration