Several improvements.
List of new files

new file:   src/master/address_book.cc
new file:   src/master/address_book.hh
new file:   src/master/address_book_page.cc
new file:   src/master/address_book_page.hh
new file:   src/master/scheduler.cc
new file:   src/master/scheduler.hh
Merge branch 'master' of github.com:vicentebolea/MRR
added DHT
Sunday
Sunday2
Added hash function
Refactoring, Commenting code
finishing integration tests
Added proposal docs and DHT class is working
after merging with youngmoon branch
DHT finished
Deleted unnecessary files
DHT modified, add str to str support
Merge branch 'youngmoon'
Merge branch 'vicente'
added poster sc2013
Merge branch 'youngmoon'
more stable
buggy version. need more dubugging