Set GSETTINGS_SCHEMA_DIR if running from source and it is not set

This allows us to run from source without installing the settings file.
Add executable permission to script when created
Remove INSTALL file

Autoconf will create this and shouldn't be tracked.
application: Reshow window if we already have one

The design of gnome-music is to only have one window, so we should just
reshow our main window when activated again.
Merge pull request #87 from kyoushuu/on-source-run

On source run
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