explain crypto
and encapsulation
simplify encapsulation diagrams
by dropping the standard packet headers
Merge branch 'master' into 40_crypto_docs

Conflicts:
	site/how-it-works.md
some rewording and some links
fix typo
make it clear that key pairs are created per connection
cosmetic
state that nonce prepending is normal in NaCl
ungarble
correct instructions for DNS sub-net
use the same /24 IP for DNS server everywhere
fix typo
refactor for consistency
Update README.md

Updated email address
Typos
Merge PR #269 from 'rade/40_crypto_docs'

Addresses #40
Merge master into gh-pages