I follow the guide doing this steps:
git clone https://github.com/telefonicaid/fiware-cygnus.git
cd fiware-cygnus/cygnus-common
mvn clean compile exec:exec ass
Solved compilation problems using 3gb of ram as said in here Packaging cygnus-common results in an empty jar
Upgrading is just following the compile as sources doc but using the cygnus 0.13 path as the flume folder (/usr/cygnus)
The error with the Grouping interceptor is solved as said by @frb:
From Cygnus 1.0.0, you must use NGSIGroupingInterceptor instead of GroupingInterceptor