split notebook style in 2 files,

app specific/not app specific

IPython/html/static/notebook/less/app.less

@@ -0,0 +1,13 b''
+@import "style.less";
+
+@import "notebook.less";
+@import "celltoolbar.less";
+@import "completer.less";
+@import "menubar.less";
+@import "notificationarea.less";
+@import "notificationwidget.less";
+@import "pager.less";
+@import "quickhelp.less";
+@import "savewidget.less";
+@import "toolbar.less";
+@import "tooltip.less";

IPython/html/static/notebook/less/style.less

@@ -1,20 +1,10 b''
 @import "variables.less";
 @import "ansicolors.less";
 @import "cell.less";
-@import "celltoolbar.less";
 @import "codecell.less";
 @import "codemirror.less";
-@import "completer.less";
 @import "highlight.less";
-@import "menubar.less";
-@import "notebook.less";
-@import "notificationarea.less";
-@import "notificationwidget.less";
 @import "outputarea.less";
-@import "pager.less";
-@import "quickhelp.less";
 @import "renderedhtml.less";
-@import "savewidget.less";
 @import "textcell.less";
-@import "toolbar.less";
-@import "tooltip.less";
+

IPython/html/static/style/style.less

@@ -17,6 +17,6 b''
 @import "../tree/less/style.less";
 
 // notebook
-@import "../notebook/less/style.less";
+@import "../notebook/less/app.less";