Specified base_uint component size

A base_uint used to be made of an array of unsigned ints. This works
fine on most platforms, but might not work on certain present or future
platforms. The code breaks if an unsigned int is 16 or 64 bits, so it's
important to be specific. Also changed "u" to "you".
Merge pull request #2629 from wyager/master

Specified base_uint component size
Link with boost_chrono library on OSX

Compiling on my OSX 10.6 build machine, I get:

Undefined symbols:
  "boost::chrono::steady_clock::now()", referenced from:
      boost::cv_status boost::condition_variable::wait_for<long long, boost::ratio<1ll, 1000000000ll> >(boost::unique_lock<boost::mutex>&, boost::chrono::duration<long long, boost::ratio<1ll, 1000000000ll> > const&)in bitcoinrpc.o

Linking against the boost_chrono fixes the issue.

Windows builds already link against boost_chrono; Linux doesn't, but compiles (on pull-tester / gitian, at least).
Merge pull request #2635 from gavinandresen/boost_chrono_osx

Link with boost_chrono library on OSX
Merge pull request #2630 from Diapolo/translations

translations update 2013-05-08 (for 0.8.2 release)
Release notes for 0.8.2rc1
Update version numbers for 0.8.2rc1 release
translations update 2013-05-13 (for 0.8.2 release)

- integrates current translations from Transifex