Don't load base style sheets in AtomEnvironment

As it will happen again right after package activation.

Signed-off-by: Nathan Sobo <nathan@github.com>

src/atom-environment.coffee

@@ -233,7 +233,6 @@ class AtomEnvironment extends Model
 
     @config.load()
 
-    @themes.loadBaseStylesheets()
     @initialStyleElements = @styles.getSnapshot()
     @themes.initialLoadComplete = true if onlyLoadBaseStyleSheets
     @setBodyPlatformClass()

src/theme-manager.coffee

@@ -126,10 +126,10 @@ class ThemeManager
   #
   # Returns a {Disposable} on which `.dispose()` can be called to remove the
   # required stylesheet.
-  requireStylesheet: (stylesheetPath) ->
+  requireStylesheet: (stylesheetPath, priority) ->
     if fullPath = @resolveStylesheet(stylesheetPath)
       content = @loadStylesheet(fullPath)
-      @applyStylesheet(fullPath, content)
+      @applyStylesheet(fullPath, content, priority)
     else
       throw new Error("Could not find a file at path '#{stylesheetPath}'")
 
@@ -175,9 +175,7 @@ class ThemeManager
     @reloadBaseStylesheets()
 
   reloadBaseStylesheets: ->
-    @requireStylesheet('../static/atom')
-    if nativeStylesheetPath = fs.resolveOnLoadPath(process.platform, ['css', 'less'])
-      @requireStylesheet(nativeStylesheetPath)
+    @requireStylesheet('../static/atom', -2)
 
   stylesheetElementForId: (id) ->
     escapedId = id.replace(/\\/g, '\\\\')
@@ -231,8 +229,8 @@ class ThemeManager
   removeStylesheet: (stylesheetPath) ->
     @styleSheetDisposablesBySourcePath[stylesheetPath]?.dispose()
 
-  applyStylesheet: (path, text) ->
-    @styleSheetDisposablesBySourcePath[path] = @styleManager.addStyleSheet(text, sourcePath: path)
+  applyStylesheet: (path, text, priority) ->
+    @styleSheetDisposablesBySourcePath[path] = @styleManager.addStyleSheet(text, {priority, sourcePath: path})
 
   activateThemes: ->
     new Promise (resolve) =>

src/workspace-element.coffee

@@ -51,7 +51,7 @@ class WorkspaceElement extends HTMLElement
         line-height: #{@config.get('editor.lineHeight')};
       }
     """
-    @styles.addStyleSheet(styleSheetSource, sourcePath: 'global-text-editor-styles')
+    @styles.addStyleSheet(styleSheetSource, {sourcePath: 'global-text-editor-styles', priority: -1})
     @views.performDocumentPoll()
 
   initialize: (@model, {@views, @workspace, @project, @config, @styles}) ->