Make pug-lint detect node_modules executables, and add options for pug-lint like the other linters

doc/ale-pug.txt

@@ -0,0 +1,44 @@
+===============================================================================
+ALE Pug Integration                                           *ale-pug-options*
+
+
+-------------------------------------------------------------------------------
+puglint                                                       *ale-pug-puglint*
+
+The puglint linter will detect configuration files based on the path to the
+filename automatically. Configuration files will be loaded in this order:
+
+1. `.pug-lintrc`
+2. `.pug-lintrc.js`
+3. `.pug-lintrc.json`
+4. `package.json`
+
+You might need to create a configuration file for your project to get
+meaningful results.
+
+g:ale_pug_puglint_executable                     *g:ale_pug_puglint_executable*
+                                                 *b:ale_pug_puglint_executable*
+  Type: |String|
+  Default: `'pug-lint'`
+
+  See |ale-integrations-local-executables|
+
+
+g:ale_pug_puglint_options                           *g:ale_pug_puglint_options*
+                                                    *b:ale_pug_puglint_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass additional options to pug-lint.
+
+
+g:ale_pug_puglint_use_global                     *g:ale_pug_puglint_use_global*
+                                                 *b:ale_pug_puglint_use_global*
+  Type: |Number|
+  Default: `0`
+
+  See |ale-integrations-local-executables|
+
+
+-------------------------------------------------------------------------------
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -72,6 +72,8 @@ CONTENTS                                                         *ale-contents*
     php...................................|ale-php-options|
       phpcs...............................|ale-php-phpcs|
       phpmd...............................|ale-php-phpmd|
+    pug...................................|ale-pug-options|
+      puglint.............................|ale-pug-puglint|
     python................................|ale-python-options|
       autopep8............................|ale-python-autopep8|
       flake8..............................|ale-python-flake8|