player: correctly pick previous track for Repeat/Shuffle off mode

Fixes #77
Fix the MediaKeys for keyboard control of music
Remove useless lines
Revert "Remove INSTALL file"

Breaks automake-1.13

This reverts commit bfd25dfa2bc68d8bf8551b7a22edea2982c5e6c1.
Merge pull request #90 from manish/master

Fix MediaKeys problem
Merge pull request #88 from roignac/master

player: correctly pick previous track for Repeat/Shuffle off mode
view: escape titles in album view title

Fixes #89
Merge pull request #94 from roignac/master

view: escape titles in album view title
Revert "Revert "Remove INSTALL file""

This reverts commit 345cd4850791e2298167fdd273e30e56509da161.
Lower required version of GTK+
view: Replace Gtk.Stack with Gd.Stack
window: Replace Gtk.Stack with Gd.Stack
toolbar: Replace Gtk.StackSwitcher to Gd.StackSwitcher
Headerbar.ui: Replace Gtk.HeaderBar with Gd.HeaderBar
toolbar: Don't set custom title on Toolbar init

This makes sure that the label created by the header is realized on init.
The setting of the state of the toolbar to 0 will do this anyway.
window: Pack header bar if GTK+ version is older than 3.9.0

gtk_window_set_titlebar was introduced in 3.9.0.
toolbar: Destroy the window on close if GTK+ version is older than 3.9.8

gtk_window_close was introduced in 3.9.8.
window: Hide titlebar when maximized if GTK+ version is older than 3.9.0

We can't set a custom titlebar before 3.9.0, so hide the titlebar from the
window manager when maximized.
Makes sure to return "Untitled" if the title of the media cannot be resolved