[PR] adding support for dependency management

Hi,

I created a PR here 
https://github.com/apache/maven-resolver-ant-tasks/pull/56

It fixes the issue reported here: 
https://github.com/apache/maven-resolver-ant-tasks/pull/56

Essentially it does two things

1. Adds support for a dependencymanagement section in the ant build file

2. defines a new task (createPom) to generate (and register) a pom based 
on the information in the ant build file.

Given this it is possible to define any type of dependencies in the ant 
build file (including using BOMs) and resolve, install, deploy etc. 
using the maven-resolver-ant-tasks.

Best regards,

Per