Merge pull request #23 from orignal/master

Merge pull request from orignal/master
Merge pull request #24 from orignal/master

delete non-responding SSU sessions
Merge pull request #25 from orignal/master

don't send session request twice
Dropping clang for now.
Merge branch 'master' of github.com:orignal/i2pd
Updating cmake so it exit if libraries are missing. Adding FindBoost and upating FindCryptoPP.
Setting debug as default build mode.
generate DH keys pair  per NTCP session
Removing FindBoost since it's apparently shipped with default cmake.
generate DH keys pair per SSU session
Merge branch 'master' of https://github.com/orignal/i2pd
DH keys supplier
Use paths for verification instead of bool variables in CMake.
if NTCP failed, try to send through SSU
endian.h for different platforms
request RouterInfo if outdated
Merge pull request #26 from orignal/master

Merge pull request from orignal/master
fix VS project
Merge pull request #52 from chertov/master

fix VS project
Initial download of hosts.txt for AddressBook