(o2) Integrate the library in the build process
(auth) Add first content for the beatport auth manager

Still needs to store the secret key for the application
(cmake) Rename version.h.in into config.h.in

Add 2 constants for Beatport API key & secret
(o2) Simplify lib building
(cmake) Fix some compile problems with includes and dependencies
(oauth) Use KEY and SECRET values to connect to beatport API
(misc) Add a singleton interface
(oauth) Do not instanciate O1Beatport at startup
(singleton) Allow mutex usage in subclasses
(singleton) Fix compile error with clang/gcc
(singleton) Fix a syntax error
(cmake/gcc) Resolve all errors with linking

Thanks to stackoverflow, once again
(singleton) Fix errors in singleton
(oauth) Set O1Beatport as Singleton
(MainWindow) Minor refactoring
(mainwindow) Add a statusbar

Display information about network status
(oauth) Try to avoid some leaks in debug

(Without success) the problems seems come from QWebView
(mainwindow) Status messages still doesn't work
(oauth) Use OAuth with SearchProvider

Still lost request, need to investigate
(search) Fix the bug with lost search requests