=> seems to be very slow

double checked for empty lists
added some better error messages in distance algorithms

changed list type of adjList variable to collection

produce less db queries but makes computing more complex)

moving calculated content out of loop (since object does not changes for
the method calls)

(so removing it from this "core" project)

fixed some problems in web application according to database connections

added node and grunt dependency to gradle (nodejs is needed by grunt)
updated gradle wrapper version (using 1.11 now)

(no more open connections should remain after testing now)

some class refactoring

(settings for gradle_krismer are now applied in jenkins directly)

reworked method visibility