Change usages of EntityUtils.consume(...); to EntityUtils.consumeQuietly(...);
Add IntelliJ IDEA project files to .gitignore.
Tidy up JAXBObject.java

1) Consolidate duplicated code.
2) Allow multiple classes to be bound on our JAXBContext objects).
Reformat pom.xml (indentation)
Add GpxToRunJson.java to convert from GPX format to nikeplus' "RunJson" format.