updated guiding notes of lab6, small style adjustments
added slides of lab 6
added http-server standalone for those who cannot find it
updated slides and guiding notes with aditional EHealthResource example
updated lab5 slides and README
guiding notes+slides+assignment in lab7
minor updates to guiding note of lab7
added simple JPA example with SQLite + H2
added restful services (jpa not entirely working)
added some examples and fixes