Snapcraft + Gradle and Maven

[Matthew Aguirre]

I have added a new plugin to snapcraft for any that are interested.
It's the ability to build a Java project that uses gradle (more 
exactly, one that uses the gradlew wrapper).

I have a quick write up of it here:
http://tros.org/dev/2016/07/13/gradle-in-snapcraft.html
with a demo example in my snapcraft fork:
https://github.com/ZenHarbinger/snapcraft/tree/demo/gradle/demos/gradle

Essentially, the plugin acts similarly to the maven plugin.
- It builds the Java jar/war artifact
- Searches for jar/war files in the 'build/libs' output directory that 
is generated during the 'jar' gradle task.
- The output is put in the snap's 'jar' or 'war' directory depending on 
the type of the output.

Maven:
Also, I have added the ability to specify maven-targets in the maven 
plugin.

This allows a developer to have a composite project file that 
references child pom.xml files.  Specifying the maven-targets will copy 
the jar/war files from the target directories of the child projects 
into the snap.

Example:
parts:
  algolink-mvn:
    plugin: maven
    source: .
    maven-targets:
      - algolink-gui
      - algolink-cli

Which allows a user to package the targets of algolink-gui and 
algolink-cli into the snap into directories of the target name.

Thanks!
--
Matt
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