Defines wepa::adt::pattern::Singleton
Merge branch 'singleton' into develop
Rename Singleton's method
Merge branch 'improve_singleton' into develop
Pattern observer with specilized subscription
Merge branch 'pattern_observer' into develop
Avoid structures that will do needed to compile with g++ version 4.7
Merge branch 'migrate_to_gcc_4_5' into develop
The best Logger you've never seen.
Merge branch 'logger' into develop
Define a new type of Logger. It will write N previous line when a ERROR level trace is detected.

It will decrease the general performance of an application, but it could be needed to study some issue.
Merge branch 'backtrace_logger' into develop
Merge branch 'develop'