Bump build flags and copyrights.

Bump copyrights to properly reflect the author. Build with all warnings
and warnings-treated-as-errors flags.
Adapt the new Storage API v2.

Added a new write() overload with tags support. Dropped the list()
method and replace it with a new find() method with tags support, too.
Framework now compiles with -Wall -pedantic -Werror options (unused arguments fixed).
Deprioritize disown checking.

If there's a heartbeat response from the engine in the I/O queue
already, but disown timer has expired, then it would've been checked
first forcing the slave to shutdown. Deprioritize it so that a
pending heartbeat from the engine would be able to cancel it.

Conflicts:

	debian/changelog
Framework correctly handles errors of socket now. Before framework threw an exception when a socket error occured. Now framework writes message to stderr and returns non-zero code to user.
Release 0.10.3.