Added builtin_topic C# example
Fixed 80-column issue on builtin_topic example
Fixed builtin_topics C# readme file
Added persistent storage C example. This example include a pps file, the original ppt file there is in sierra /home/angel/examples/persistent_storage
Added persistent storage C++ example
Added persistent storage Java example
Added persistent storage C# example
Fixed 80-row per line in persistent storage java example
Reviewing documentation
Added coherent presentation C example
Added coherent presentation C++ example
Added coherent presentation example
Fixed documentation issues in persistent storage example
Added coherent presentation java example
Merge branch 'example/community'