Bump version to 0.3.25

Yes, we might release as v0.4, but let's just do a simple increment
for now.
doc/README: word wrap into something readable
Bugfix: add autogenerated addresses to address book
Fix makefile.linux-mingw
Merge pull request #404 from TheBlueMatt/newenc

Fix makefile.linux-mingw
fix warning: variable ‘nMinDepth’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Giel van Schijndel <me@mortis.eu>
fix warning: control reaches end of non-void function [-Wreturn-type]

Signed-off-by: Giel van Schijndel <me@mortis.eu>
Merge pull request #405 from sipa/syncdefault

Bugfix: add autogenerated addresses to address book
Merge pull request #406 from muggenhor/warning-fixes

Warning fixes
Fix crashes when a wallet is locked and GetReservedKey() is called
Merge pull request #409 from TheBlueMatt/master

Fix crashes when a wallet is locked and GetReservedKey() is called
Generate Warning when using default key.
Single DB transaction for all addresses in a message

Cuts disk activity at startup immensely
Merge pull request #410 from TheBlueMatt/master

Generate Warning when using default key.
Fix Build in GetReservedKey() in wallet.cpp
Merge pull request #411 from TheBlueMatt/master

Fix Build in GetReservedKey() in wallet.cpp
Single DB transaction for addresses from DNS seeds
Merge pull request #412 from sgimenez/db-transactions

Single DB transactions
Fix bad return values in LoadWallet.
Merge pull request #413 from TheBlueMatt/loadwalletret

Fix bad return values in LoadWallet.