plyvel required only for kickstart
typo
Merge pull request #483 from JahPowerBit/develop

plyvel required only for kickstart
tweaks
Merge pull request #484 from JahPowerBit/develop

tweaks
wording
new version checking (fixes #203)
elegant protocol changes (fixes #458)
replace `devise()` (fixes #72)
typo
check that provided public, private keys match source address (fixes #104)
message initialise functions (fixes #193)
`scrypt.py`
new version checking (fixes #203)
message initialise functions (fixes #193)
‘destroy’ functionality (fixes #145)