Added line number toggle and colorscheme customization

- <leader>n to toggle line numbers
- source ~/.vimcustom (if exists) for custom colorscheme
- disable airline theme (let it inherit from colorscheme
-

.vimrc

@@ -129,6 +129,7 @@ Plug 'bullets-vim/bullets.vim'
 Plug 'vim-airline/vim-airline'
 Plug 'vim-airline/vim-airline-themes'
 
+
 call plug#end()
 
 " ---------------------------------------------------------------------------------------------------------------------
@@ -163,7 +164,8 @@ let g:bullets_outline_levels = ['num', 'abc', 'std*', 'std+', 'std-']
 
 "vim-airline
 let g:airline#extensions#tabline#enabled = 1
-let g:airline_theme = 'angr'
+let g:airline_detect_theme_from_guicolors = 1
+"let g:airline_theme = 'angr'
 
 " FZF Actions
 " <c-x> to open FZF result in a split
@@ -177,17 +179,9 @@ let g:fzf_action = {
 " ---------------------------------------------------------------------------------------------------------------------
 " ==> Colors 
 "     Term GUI Colors
-"     Testing different colorschemes
+"     colorscheme replaced by ~/.vimcustom
-"     Only the last uncommented colorscheme will be used
+"     If there is a file at ~/.vimcustom, the colorscheme defined in that file
-"     This is typically a history of the schemes I've used
+"     will be applied. If not, colorscheme defaults to 'darkburn'
-"colorscheme slate 
-"colorscheme marklar
-"colorscheme automation
-"colorscheme advantage
-"colorscheme industry
-"colorscheme industrial
-"colorscheme jelleybeans
-colorscheme darkburn
 
 "     cursorcolumn
 hi cursorcolumn cterm=NONE ctermbg=black ctermfg=white
@@ -261,6 +255,9 @@ nnoremap <leader>f :call fzf#run(fzf#vim#with_preview(fzf#wrap({'source': 'find
 " Toggles line wrapping with linebreak enabled when wrapping is turned on with <leader>w
 nnoremap <leader>w :execute "if &wrap\n  set nowrap\nelse\n  set wrap linebreak\nendif"<CR>
 
+" Toggle line numbers
+nnoremap <leader>n :set number! relativenumber!<CR>
+
 " ---------------------------------------------------------------------------------------------------------------------
 " ==> Keymaps: Text bubbling (http://vimcasts.org/episodes/bubbling-text/)
 
@@ -390,3 +387,14 @@ autocmd FileType netrw setl bufhidden=delete
 "
 autocmd BufNewFile,BufReadPost *.{yaml,yml} set filetype=yaml  foldmethod=indent
 autocmd FileType yaml setlocal ts=2 sts=2 sw=2 expandtab
+
+" ---------------------------------------------------------------------------------------------------------------------
+" ==> Source Local Customizations and Set Colorscheme
+
+let s:custom_config_path = expand('$HOME/.vimcustom')
+
+if filereadable(s:custom_config_path)
+  execute 'source' fnameescape(s:custom_config_path)
+else
+  colorscheme darkburn
+endif