Improve merged file generation (HerringtonDarkholme#283)

* Generate typescriptcommon.vim merged file as well

This is how vim is organised now.

* Respect indentation when merging files

* Avoid indenting empty lines

* Regenerate merged files

Author: tobil4sk

merge.js

@@ -2,17 +2,20 @@ var fs = require('fs')
 
 var entry = fs.readFileSync('syntax/typescript.vim', 'utf8')
 var entryReact = fs.readFileSync('syntax/typescriptreact.vim', 'utf8')
+var common = fs.readFileSync('syntax/common.vim', 'utf8')
 
-function replace(_, filename) {
+function replace(_, indentation, filename) {
   var source = fs.readFileSync(filename, 'utf8')
-  return importFile(source)
+  return importFile(source.replace(/^(?!$)/gm, indentation))
 }
 
 function importFile(source) {
-  return source.replace(/^\s*runtime (.+)?/gm, replace)
+  return source.replace(/^([ \t]*)runtime (.+)?/gm, replace)
 }
 
 var merged = importFile(entry)
 var mergedReact = importFile(entryReact)
+var mergedCommon = importFile(common)
 fs.writeFileSync('merged/typescript.vim', merged)
 fs.writeFileSync('merged/typescriptreact.vim', mergedReact)
+fs.writeFileSync('merged/typescriptcommon.vim', mergedCommon)