Removed syntastic and replaced it with ale

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

sources_non_forked/ale/autoload/ale/balloon.vim

@@ -0,0 +1,28 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: balloonexpr support for ALE.
+
+function! ale#balloon#MessageForPos(bufnr, lnum, col) abort
+    " Don't show balloons if they are disabled, or linting is disabled.
+    if !ale#Var(a:bufnr, 'set_balloons')
+    \|| !g:ale_enabled
+    \|| !getbufvar(a:bufnr, 'ale_enabled', 1)
+        return ''
+    endif
+
+    let l:loclist = get(g:ale_buffer_info, a:bufnr, {'loclist': []}).loclist
+    let l:index = ale#util#BinarySearch(l:loclist, a:bufnr, a:lnum, a:col)
+
+    return l:index >= 0 ? l:loclist[l:index].text : ''
+endfunction
+
+function! ale#balloon#Expr() abort
+    return ale#balloon#MessageForPos(v:beval_bufnr, v:beval_lnum, v:beval_col)
+endfunction
+
+function! ale#balloon#Disable() abort
+    set noballooneval balloonexpr=
+endfunction
+
+function! ale#balloon#Enable() abort
+    set ballooneval balloonexpr=ale#balloon#Expr()
+endfunction