🐧 .desktop file without capital letter

The .desktop file of Atom was named Atom.desktop but it should be
renamed to atom.desktop because a .desktop should not contain capital
letters as any other .desktop files in /usr/share/applications.

Note that without that, it can be not easy to link the window with the
.desktop file and then a dock/panel could not link a launcher with its
window.

build/tasks/install-task.coffee

@@ -40,11 +40,11 @@ module.exports = (grunt) ->
       mkdir path.dirname(shareDir)
       cp shellAppDir, shareDir
 
-      # Create Atom.desktop if installation not in temporary folder
+      # Create atom.desktop if installation not in temporary folder
       tmpDir = if process.env.TMPDIR? then process.env.TMPDIR else '/tmp'
       if installDir.indexOf(tmpDir) isnt 0
-        desktopFile = path.join('resources', 'linux', 'Atom.desktop.in')
-        desktopInstallFile = path.join(installDir, 'share', 'applications', 'Atom.desktop')
+        desktopFile = path.join('resources', 'linux', 'atom.desktop.in')
+        desktopInstallFile = path.join(installDir, 'share', 'applications', 'atom.desktop')
 
         {description} = grunt.file.readJSON('package.json')
         iconName = path.join(shareDir, 'resources', 'app', 'resources', 'atom.png')

build/tasks/mkdeb-task.coffee

@@ -39,7 +39,7 @@ module.exports = (grunt) ->
     getInstalledSize buildDir, (error, installedSize) ->
       data = {name, version, description, section, arch, maintainer, installDir, iconName, installedSize}
       controlFilePath = fillTemplate(path.join('resources', 'linux', 'debian', 'control'), data)
-      desktopFilePath = fillTemplate(path.join('resources', 'linux', 'Atom.desktop'), data)
+      desktopFilePath = fillTemplate(path.join('resources', 'linux', 'atom.desktop'), data)
       icon = path.join('resources', 'atom.png')
 
       cmd = path.join('script', 'mkdeb')