Add docs and test015 for where-indentation (2+2)

Author: mheinzel

README.md

@@ -96,6 +96,16 @@ indentation using *hindent*.
         where f :: Int -> Int
         >>>>>>f x = x
 
+* `let g:haskell_indent_before_where = 2`
+
+        foo
+        >>where
+
+* `let g:haskell_indent_after_bare_where = 2`
+
+        where
+        >>foo
+
 * `let g:haskell_indent_do = 3`
 
         do x <- a

doc/haskell-vim.txt

@@ -84,6 +84,8 @@ Haskell~
   * |haskell-vim-indent-case|
   * |haskell-vim-indent-let|
   * |haskell-vim-indent-where|
+  * |haskell-vim-indent-before-where|
+  * |haskell-vim-indent-after-bare-where|
   * |haskell-vim-indent-do|
   * |haskell-vim-indent-in|
   * |haskell-vim-indent-guard|
@@ -113,6 +115,18 @@ Haskell~
 
         where f :: Int -> Int
         >>>>>>f x = x
+<
+                                                 *haskell-vim-indent-before-where*
+* let g:haskell_indent_before_where = 2 >
+
+        foo
+        >>where
+<
+                                             *haskell-vim-indent-after-bare-where*
+* let g:haskell_indent_after_bare_where = 2 >
+
+        where
+        >>foo
 <
                                                            *haskell-vim-indent-do*
 * let g:haskell_indent_do = 3 >

tests/indent/test015/expected.hs

@@ -0,0 +1,3 @@
+f x = y
+  where
+    y = 2 * x

tests/indent/test015/test.hs

@@ -0,0 +1,3 @@
+f x = y
+where
+y = 2 * x

tests/indent/test015/test.vim

@@ -0,0 +1,6 @@
+:set sw=4
+:let g:haskell_indent_before_where=2
+:let g:haskell_indent_after_bare_where=2
+=G
+:saveas! result.hs
+:q!