fixed signed-unsigned issue from 166

Loss of entropy can be discussed at a later time, but is
not deemed a significant issue for now.
fix for miniupnpc static compile under Windows
split mnemonic printout over 3 lines
added unbound to external deps
minor English wordlist tweaks
added aabramov's gpg key
Merge pull request #171

32be6ae added aabramov's gpg key (Riccardo Spagni)
010bfcf minor English wordlist tweaks (Riccardo Spagni)
9ef094b added unbound to external deps (Riccardo Spagni)
732493c split mnemonic printout over 3 lines (Riccardo Spagni)
Merge pull request #167

aeaa44f fixed signed-unsigned issue from 166 (Thomas Winget)
Merge pull request #170

46f26ff another typo fix (David G. Andersen)
ac6bc48 fix typo (David G. Andersen)
d744dd1 More documentation (David G. Andersen)
4d493f6 initial doxygen commenting of the CryptoNight proof-of-work code (David G. Andersen)
Fix comment start for two functions