profile and property for fat-jar. Fixes #21.

[bmarwell]

Adds a property and a profile. Both will work. E.g.

• mvn clean install -Ppackage,jar-with-dependencies
• mvn clean install -Ppackage -Djar.dependencies.skip=false

#21

[tresf]

I find jar to be redundant all profiles produce a jar. I'd like simply with-dependencies if there are no objections.

[tresf]

I find jar to be redundant all profiles produce a jar. I'd like simply with-dependencies if there are no objections.

Sorry, just realized this is a predefined property. Looks good!

[tresf]

Just made a minor change to the variable name foo.bar.skip instead of skip.foo.bar to be consistent with our other variable names.