Removed syntastic and replaced it with ale

Read more here:
https://github.com/w0rp/ale

sources_non_forked/ale/after/plugin/ale.vim

@@ -0,0 +1,37 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Follow-up checks for the plugin: warn about conflicting plugins.
+
+" A flag for ensuring that this is not run more than one time.
+if exists('g:loaded_ale_after')
+    finish
+endif
+
+" Set the flag so this file is not run more than one time.
+let g:loaded_ale_after = 1
+
+" Check if the flag is available and set to 0 to disable checking for and
+" emitting conflicting plugin warnings.
+if exists('g:ale_emit_conflict_warnings') && !g:ale_emit_conflict_warnings
+    finish
+endif
+
+" Conflicting Plugins Checks
+
+function! s:GetConflictingPluginWarning(plugin_name) abort
+    return 'ALE conflicts with ' . a:plugin_name
+    \   . '. Uninstall it, or disable this warning with '
+    \   . '`let g:ale_emit_conflict_warnings = 0` in your vimrc file, '
+    \   . '*before* plugins are loaded.'
+endfunction
+
+if exists('g:loaded_syntastic_plugin')
+    throw s:GetConflictingPluginWarning('Syntastic')
+endif
+
+if exists('g:loaded_neomake')
+    throw s:GetConflictingPluginWarning('Neomake')
+endif
+
+if exists('g:loaded_validator_plugin')
+    throw s:GetConflictingPluginWarning('Validator')
+endif