v1.4.0

• Changed Allow variable tokens to start with $. gh-455
• Changed fs loader should take cwd as default base path. gh-419
• Changed handle errors which occur at the time of rendering. gh-417
• Changed default options in bin (varControls, tagControls, cmtControls). gh-415
• Changed null should yield empty string when resolving variable. gh-408
• Added Escape character for date filter argument. gh-427, gh-432
• Added Make if and elseif throw a better error message when a tag body is omitted. gh-425
• Fixed don't throw errors on accessing property of null object. gh-471
• Fixed loop variables work correctly in nested loops. gh-433
• Fixed Some IE8 compatibility (require es5). gh-428