Changed order of community methods, on_intro_request check for my_member
mid instead
No more _decode_message, changed some of the DropPacket exceptions to
only use can_decode_message
Remove length constraints from decode_message, can_decode_message has to
handle those.
Spelling mistakes + shortened method name
Merge pull request #282 from NielsZeilemaker/intro_duplicates

Intro duplicates
remove walk_advice* statistics
remove walk_bootstrap* statistics
change some statistics to properties
refactory walk statistics
add total_candidates_discovered into CommunityStatistics
small changes
add MessageStatistics
replace success dict and success_count
replace outgoing dict
replace created dict and created_count
small fixes
replace drop dict and drop_count
fix community initialization problem
fix + replace delay_count and delay dict
replace delay_send, delay_success, and delay_timeout