Massively reduce the amount of code needed for linter tests

autoload/ale/handlers/rails_best_practices.vim

@@ -1,6 +0,0 @@
-call ale#Set('ruby_rails_best_practices_options', '')
-call ale#Set('ruby_rails_best_practices_executable', 'rails_best_practices')
-
-function! ale#handlers#rails_best_practices#GetExecutable(buffer) abort
-    return ale#Var(a:buffer, 'ruby_rails_best_practices_executable')
-endfunction

autoload/ale/handlers/tslint.vim

@@ -0,0 +1,13 @@
+function! ale#handlers#tslint#InitVariables() abort
+    call ale#Set('typescript_tslint_executable', 'tslint')
+    call ale#Set('typescript_tslint_config_path', '')
+    call ale#Set('typescript_tslint_rules_dir', '')
+    call ale#Set('typescript_tslint_use_global', get(g:, 'ale_use_global_executables', 0))
+    call ale#Set('typescript_tslint_ignore_empty_files', 0)
+endfunction
+
+function! ale#handlers#tslint#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'typescript_tslint', [
+    \   'node_modules/.bin/tslint',
+    \])
+endfunction