Fix vim solarized dark theme

See altercation/solarized#240

.vim/colors/solarized.vim

@@ -469,7 +469,7 @@ endif
 " ---------------------------------------------------------------------
 
 exe "let s:bg_none      = ' ".s:vmode."bg=".s:none   ."'"
-exe "let s:bg_back      = ' ".s:vmode."bg=".s:back   ."'"
+exe "let s:bg_back      = ' ".s:vmode."bg=".s:none   ."'"
 exe "let s:bg_base03    = ' ".s:vmode."bg=".s:base03 ."'"
 exe "let s:bg_base02    = ' ".s:vmode."bg=".s:base02 ."'"
 exe "let s:bg_base01    = ' ".s:vmode."bg=".s:base01 ."'"
@@ -666,7 +666,7 @@ exe "hi! DiffAdd"        .s:fmt_revr   .s:fg_green  .s:bg_none
 exe "hi! DiffChange"     .s:fmt_revr   .s:fg_yellow .s:bg_none
 exe "hi! DiffDelete"     .s:fmt_revr   .s:fg_red    .s:bg_none
 exe "hi! DiffText"       .s:fmt_revr   .s:fg_blue   .s:bg_none
-exe "hi! SignColumn"     .s:fmt_none   .s:fg_base0  .s:bg_base02
+exe "hi! SignColumn"     .s:fmt_none   .s:fg_base0  .s:bg_none
 exe "hi! Conceal"        .s:fmt_none   .s:fg_blue   .s:bg_none
 exe "hi! SpellBad"       .s:fmt_curl   .s:fg_none   .s:bg_none    .s:sp_red
 exe "hi! SpellCap"       .s:fmt_curl   .s:fg_none   .s:bg_none    .s:sp_violet