Changed the observer diagram.
Minor refactoring on the observer code.
Merge pull request #10 from mafagafogigante/mafagafo-observer

Changes to the observer pattern
Update README.md
Update README.md
add part of class diagram
add part of class diagram
add rest of class diagrams
add editable diagram files
(you need to install objectaid eclipse plugin to view that)
update README with new diagram
update README
add some use case
Merge pull request #11 from llitfkitfk/master

add some class diagram for each design pattern
Update README.md
#12 Added private constructor to ThreadSafeLazyLoadedIvoryTower.
Update README.md
Update README.md
Simplifies an if statement
Uses a StringBuilder to improve performance.

Also stops initializing a variable (removes an unused initialization).
Improves a toString method.

Makes it more readable and deletes an useless semicolon.