Removed syntastic and replaced it with ale

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

sources_non_forked/ale/ale_linters/haskell/hdevtools.vim

@@ -0,0 +1,22 @@
+" Author: rob-b, Takano Akio <tak@anoak.io>
+" Description: hdevtools for Haskell files
+
+call ale#Set('haskell_hdevtools_executable', 'hdevtools')
+call ale#Set('haskell_hdevtools_options', '-g -Wall')
+
+function! ale_linters#haskell#hdevtools#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'haskell_hdevtools_executable')
+endfunction
+
+function! ale_linters#haskell#hdevtools#GetCommand(buffer) abort
+    return ale#Escape(ale_linters#haskell#hdevtools#GetExecutable(a:buffer))
+        \ . ' check ' . ale#Var(a:buffer, 'haskell_hdevtools_options')
+        \ . ' -p %s %t'
+endfunction
+
+call ale#linter#Define('haskell', {
+\   'name': 'hdevtools',
+\   'executable_callback': 'ale_linters#haskell#hdevtools#GetExecutable',
+\   'command_callback': 'ale_linters#haskell#hdevtools#GetCommand',
+\   'callback': 'ale#handlers#haskell#HandleGHCFormat',
+\})