Add Rakefile tasks for (un)install

Added Rakefile that does install and uninstall.

Also providded are sub-tasks that do things like build GitX, copy it to
~/Applications/ or /Applications/, cleaning the build and removing GitX.app

Signed-off-by: Pieter de Bie <pdebie@ai.rug.nl>

Rakefile

@@ -0,0 +1,49 @@
+require 'ftools'
+
+target_locations = [
+  File::expand_path("~/Applications/"),
+  "/Applications/"
+]
+
+desc "Build and install (or upgrade) GitX"
+task :install => [:uninstall_app, :build_app, :install_app]
+desc "Clean build directory, uninstall application"
+task :uninstall => [:clean_app, :uninstall_app]
+desc "Clean build directory"
+task :clean => [:clean_app]
+
+desc "Build gitX using XCode"
+task :build_app do
+  system("xcodebuild")
+end
+
+task :clean_app do
+  system("xcodebuild -alltargets clean OBJROOT=build/ SYMROOT=build/")
+end
+
+desc "Copies the built GitX.app to the application folder"
+task :install_app do
+  target_locations.each do |loc|
+    if File.directory?(loc)
+      puts "Copying to (#{loc})"
+      File.copy("build/Release/GitX.app/", loc)
+      break
+    end
+  end
+end
+
+desc "Remove GitX.app from ~/Applications/ or /Applications/"
+task :uninstall_app do
+  found = false
+  target_locations.each do |loc|
+    cur_path = File.join(loc, "GitX.app")
+    puts "Checking #{cur_path}"
+    if File.exists?( cur_path )
+      puts "Removing GitX.app from #{cur_path}"
+      system("rm", "-rf", cur_path)
+      found = true
+      break
+    end
+  end
+  puts "Couldn't find installed GitX.app" unless found
+end