moves java srcs so as to introduce package structure
introduced Maven to pb-java
updates dependent modules to up-to-date version as possible
introduced Java Doc
redused direct dependency on class MagicParameters such as debug and readFile
removes direct dependency between Main and MagicParameters
minor refactoring
supports additional APIs with major reforming
abolished HttpDeleteWithBody
Corrects Java Doc comment in PandorabotsAPI.java
Merge pull request #2 from yyconn/modernize

merge branch Modernize from yyconn