Correct handling of integral values.

dynamic_t::as_int retuns value only if "this" stores dynamic_t::int_t and throws otherwise (for example, if "this" stores uint_t). So correct way to retrieve integral value from dynamic_t is using of method dynamic_t::to<YourIntegralType>.
Fix debianization, part 2.

Now dynamic_t is part of libcocaine-dev.