songbook 0.4 released with [[!toggle text="these changes"]]

[[!toggleable text="""
 + New songs:
   + Alain Bashung - Gaby, oh Gaby
   + Avril Lavigne - Things I'll never say
   + Bob Dylan - Blowin in the wind
   + Carter Family - In the highways + Keep on the sunny side
   + Cat Stevens - Sad Lisa
   + Cat Stevens - The wind
   + Eels - Dirty girl
   + Eels - Hey man
   + Eels - I like birds
   + Eels - Packing blankets
   + Garfunkel and Oates - Fuck You.
   + Georges Brassens - Cupidon s'en fout
   + Georges Brassens - Grand-père
   + Georges Brassens - Le gorille
   + Georges Brassens - Les copains d'abord
   + Graeme Allwright - Johnny
   + Graeme Allwright - La mouche bleue
   + Graeme Allwright - Petit garcon
   + Green Day - Boulevard of Broken Dreams
   + Howie Day - Collide
   + Kana - Plantation
   + La Rue Ketanou - La Rue Ketanou
   + Les Cowboys Fringants - La manifestation
   + Les Cowboys Fringants - Toune d'Automne
   + Les Tit's Nassels - Les Tit's ballades
   + Linkin Park - Numb
   + Moriarty - Jimmy
   + Oasis - Wonderwall
   + Oldelaf et Monsieur.D - Nathalie
   + Patrick Bouchitey - Jesus reviens
   + Pierre Perret - Lily
   + Pow Wow - Le lion est mort ce soir
   + Radiohead - Creep
   + Renaud - Petite fille des sombres rues
   + Simon & Garfunkel - Cecilia
   + Simon & Garfunkel - El condor pasa
   + Simon & Garfunkel - Feeling groovy
   + Terra Naomi - Say it's possible
   + The Beatles - Ob-la-di ob-la-da
   + The Beatles - Yellow submarine
   + The Beatles - Yesterday
   + The Eagles - Hotel California
   + The Pogues - Fairytale of New-York
   + Tri Yann - Les prisons de Nantes
   + Tri Yann - Si Mors A Mors
 + Corrections of mistakes and typos
 + Add cover picture to each song
 + Update songs package to v2.8
 + Update makefile to be POSIX compilant
"""]]