Issue #76

[abstratt]

This is work-in-progress for Issue #76, please do not merge, sharing partial progress for feedback.

• first stab: not touching Eclipse bundles yet (no Tycho yet)
• removing jars that can now be obtained via Maven
• removing Eclipse configuration files that are now automatically generated when imported as Maven projects
• some tests were relying on both JUnit 4 and 5 - using JUnit 5 only now, which required some changes due to non-backward compatible changes in JUnit 5
• renamed test source path for the test module
• enabled CI on Travis CI (based on a fork of this repository under my own GitHub user as this repository does not have Travis enabled yet), but we could move elsewhere. Note that there ~is~ was one test failing, but that was the case already in master (this change from January changed how resolveModelFile() works for files with errors, so it now returns a UnitDefinition even if there are errors, as the test ~expects~ expected a null UnitDefinition to be returned, ~which I guess is - and maybe already was - an invalid expectation).~ I changed the test so it expects a non-null result.

[abstratt]

@seidewitz This is now ready for review. The only thing I didn't do yet is to generate the dist jars with their final names, I am ATM generating them using a "new-" prefix, so they do not overwrite yet the dist files you created by hand.

Oh, the other thing I didn't enable was enabling CI on Travis (as I did in my fork under my own user name) and pushing the binaries to a Maven repository like Bintray (as I did with my own projectsd) because you probably should (must?) be the one enabling Travis-CI for the ModelDriven organization on GitHub and crfeating the project on Bintray.

[abstratt]

@seidewitz Please see final changes just committed, which include sections for the README.md file. Also, this still does not clobber the existing archives you have been creating by hand, but instead produces the packages using a -new suffix, so you can compare them easily (once the results are deemed valid, we should change the pom.xml file to remove the use of the prefix (look for notes such as TODO-RC: remove new- prefix once validated). Please see above: https://github.com/ModelDriven/Alf-Reference-Implementation/pull/94#issuecomment-653973129).

Any further questions, please let me know.