fix compile error caused by wrong logger
add config file for travis ci
add missing gradle jar
switch to logback, fixed compile errors
replaced log4j config with logback config file
use logback outputstream appender for capturing logged output
Merge branch 'refs/heads/master' into cling
upgrade gradle wrapper from 1.9 to 1.10
Merge branch 'refs/heads/master' into cling
switch to slf4j logger
updated formatter settings
extracted cling version into variable
fixed compile errors and added an initial test
configured java.util.logging-to-slf4j bridge
fixed compiler warnings