Switch to zathura as pdf previewer for vimtex

vim/ftplugin/tex.vim

@@ -5,6 +5,9 @@ if !has("nvim")
                 \}
 endif
 
+let g:latex_view_general_viewer = 'zathura'
+let g:vimtex_view_method = 'zathura'
+
 if has("nvim")
     if !exists('g:deoplete#omni#input_patterns')
         let g:deoplete#omni#input_patterns = {}
@@ -13,3 +16,7 @@ if has("nvim")
 endif
 
 set conceallevel=0
+
+" spell checking
+set spell
+set spell spelllang=de

vimrc.symlink

@@ -34,7 +34,7 @@ Plug 'tpope/vim-repeat'
 Plug 'vim-syntastic/syntastic'
 Plug 'altercation/vim-colors-solarized'
 Plug 'godlygeek/tabular' " Align text on symbols
-Plug 'ludovicchabant/vim-gutentags'
+Plug 'ludovicchabant/vim-gutentags', { 'for': ['php', 'c', 'cpp'] }
 Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': './install --all' } " fuzzy file finder
 Plug 'junegunn/fzf.vim' " vim integration for fzf
 if has("nvim")