Rename highlight groups: `plugin.` to `plugin:`

Ref #1216

powerline/config_files/themes/vim/plugin_gundo-preview.json

@@ -3,12 +3,12 @@
 		"left": [
 			{
 				"type": "string",
-				"highlight_groups": ["gundo.name", "file_name"],
+				"highlight_groups": ["gundo:name", "file_name"],
 				"contents": "Undo diff"
 			},
 			{
 				"type": "string",
-				"highlight_groups": ["gundo.background", "background"],
+				"highlight_groups": ["gundo:background", "background"],
 				"draw_soft_divider": false,
 				"draw_hard_divider": false,
 				"width": "auto"

powerline/config_files/themes/vim/plugin_gundo.json

@@ -3,12 +3,12 @@
 		"left": [
 			{
 				"type": "string",
-				"highlight_groups": ["gundo.name", "file_name"],
+				"highlight_groups": ["gundo:name", "file_name"],
 				"contents": "Undo tree"
 			},
 			{
 				"type": "string",
-				"highlight_groups": ["gundo.background", "background"],
+				"highlight_groups": ["gundo:background", "background"],
 				"draw_soft_divider": false,
 				"draw_hard_divider": false,
 				"width": "auto"

powerline/segments/vim/plugin/nerdtree.py

@@ -14,12 +14,12 @@ from powerline.segments.vim import window_cached
 def nerdtree(pl):
 	'''Return directory that is shown by the current buffer.
 
-	Highlight groups used: ``nerdtree.path`` or ``file_name``.
+	Highlight groups used: ``nerdtree:path`` or ``file_name``.
 	'''
 	if not bufvar_exists(None, 'NERDTreeRoot'):
 		return None
 	path_str = vim.eval('getbufvar("%", "NERDTreeRoot").path.str()')
 	return [{
 		'contents': path_str,
-		'highlight_groups': ['nerdtree.path', 'file_name'],
+		'highlight_groups': ['nerdtree:path', 'file_name'],
 	}]

powerline/segments/vim/plugin/syntastic.py

@@ -20,7 +20,7 @@ def syntastic(pl, err_format='ERR:  {first_line} ({num}) ', warn_format='WARN
 	:param str warn_format:
 		Format string for warnings.
 
-	Highlight groups used: ``syntastic.warning`` or ``warning``, ``syntastic.error`` or ``error``.
+	Highlight groups used: ``syntastic:warning`` or ``warning``, ``syntastic:error`` or ``error``.
 	'''
 	if not vim_global_exists('SyntasticLoclist'):
 		return None
@@ -33,11 +33,11 @@ def syntastic(pl, err_format='ERR:  {first_line} ({num}) ', warn_format='WARN
 	if errors:
 		segments.append({
 			'contents': err_format.format(first_line=errors[0]['lnum'], num=len(errors)),
-			'highlight_groups': ['syntastic.error', 'error'],
+			'highlight_groups': ['syntastic:error', 'error'],
 		})
 	if warnings:
 		segments.append({
 			'contents': warn_format.format(first_line=warnings[0]['lnum'], num=len(warnings)),
-			'highlight_groups': ['syntastic.warning', 'warning'],
+			'highlight_groups': ['syntastic:warning', 'warning'],
 		})
 	return segments