Changed package structure and eliminated obsolete abstract repository class

src/de/uni_passau/fim/gitwrapper/BlameLine.java

src/de/uni_passau/fim/gitwrapper/Branch.java

src/de/uni_passau/fim/gitwrapper/Commit.java

src/de/uni_passau/fim/gitwrapper/DefaultMergeStrategy.java

src/de/uni_passau/fim/gitwrapper/DummyCommit.java

src/de/uni_passau/fim/gitwrapper/GitWrapper.java

src/de/uni_passau/fim/gitwrapper/MergeConflict.java

src/de/uni_passau/fim/gitwrapper/MergeStrategy.java

src/de/uni_passau/fim/gitwrapper/Reference.java

src/de/uni_passau/fim/gitwrapper/Repository.java

src/de/uni_passau/fim/gitwrapper/Status.java

src/de/uni_passau/fim/processexecutor/ProcessExecutor.java

...i_passau/fim/processexecutor/ToolNotWorkingException.java

src/de/uni_passau/fim/processexecutor/ToolWrapper.java

src/de/uni_passau/fim/seibt/gitwrapper/repo/Repository.java