Add structure to type of tile
Add structure type and add beach
field generator use only block tiles
clean difference between Tile.t and Tile_t.t
Started adding pretty-printers for the various types in the music model.
Module UnionFind
Fix make doc
add priority queue module in utils
small changes
Add dependency ounit in configure.ac
Merge branch 'music_dev' of https://github.com/GL-MPRI-2014/GL_MPRI_2014 into music_dev
Started adding pretty-printing facilities for all defined structures.

For debugging purposes.
First iteration of settings screen
Completed print_pitchClass implementation
Added back button
Quick visual refactoring on function print_pitchClass.
Add movement type All
Merge branch 'master' into generation
Merge branch 'engine_dev' into generation

Conflicts:
	src/common/Tile.ml
oups, Merge branch 'master' into generation