Issue1973 Add gradle tasks to generate Deb and RPM packages

[lcai006]

Issue #1973
Add gradle tasks to generate Deb and RPM packages.
Package includes umple.jar, a bash script to run umple, copyright and README of umple, a manpage zip file of umple.
Related files are in dev-tools/files directory

Thes gradle tasks are using gradle-ospackage-plugin.
Run below after build the project in umple/

./gradlew genPackages

This task creates packages in umple/dist/gradle/distributions directory

[TimLethbridge]

Good start.

Instead of using dev-tools as the directory for the three files, please use the build directory ... the dev-tools directory is for scripts that are used by developers of Umple itself.

And instead of 'files' as the subdirectory, please use a more meaningful name such as rpmfiles for the files used to build rpm.

Also there is already a license for Umple in LICENSE.md. Is there a way this could just be copied directly, rather than being duplicated>? This is am MIT license. I have been putting the names of all the authors there, so it may change over time. Also I have updated the date periodically.

Please fix these (or at least reply), then I will test.

Also in the issue, it would be good if you could tell me how I might set the resulting package up so I can test it using an apt or a yum command

[lcai006]

Good start.

Instead of using dev-tools as the directory for the three files, please use the build directory ... the dev-tools directory is for scripts that are used by developers of Umple itself.

And instead of 'files' as the subdirectory, please use a more meaningful name such as rpmfiles for the files used to build rpm.

Also there is already a license for Umple in LICENSE.md. Is there a way this could just be copied directly, rather than being duplicated>? This is am MIT license. I have been putting the names of all the authors there, so it may change over time. Also I have updated the date periodically.

Please fix these (or at least reply), then I will test.

Also in the issue, it would be good if you could tell me how I might set the resulting package up so I can test it using an apt or a yum command

Above issues fixed.

To install the packages:
#1973