Refactoring and license change (Library GPL → LGPLv3)

[floscher]

I've done several things for this pull request:

• deleted the JavaDoc as it can easily be regenerated with ant javadoc or make docs
• deleted *.class files as these can be regenerated with ant classes or make all
• deleted the *.tar.gz archives of v1.0.13 and v1.0.14 as GitHub automatically provides those for all git tags (see https://github.com/floscher/java-getopt/releases)
• deleted the *.jar archives of v1.0.13 and v1.0.14 as these can easily be regenerated with ant jar
• switched license to LGPLv3 as discussed in #8
• moved the non-source files (README, LANGUAGES, ChangeLog, buildx.xml, Makefile) to the root directory
• added a .gitignore file, which prevents the files generated by Ant and/or make to be commited into git

For the lazy people who don't want to generate JavaDoc, *.class files and *.jar archives for themselves, I've done that already for the versions 1.0.8 to 1.0.14 (the only ones I found online) and uploaded those to https://github.com/floscher/java-getopt/releases (the class files are inside the jars).

@arenn if you want to apply all the changes mentioned above, just review them in the "Files changed" tab and then click the green button "Merge pull request" at the bottom to apply all changes to your master-branch. If you want me to remove or change something in this pull request, just post it here and I'll update the pull request accordingly.