HELLO WORLD! Basic compiler skeleton up

All files in the helloworld folder. Once in folder, can test with:
```python svelCompile.py helloworld.svel```
Will get an output helloworld.py, which can be run and just prints "Hello World!"
Merge pull request #5 from kaitlinhuben/master

HELLO WORLD! Basic compiler skeleton up
created jextractor class (Java extractor) to extract neccessary info from Java files. currently gets method signatures and return types