Re-import history.js v1.8 (take 2).

- Current history.js 1.8 is bit outdated.  It seems pre-release tree of
  v1.8 maybe?  This diff includes 2 bugfix patches.  I fetched the
  latest zip from:
  https://github.com/browserstate/history.js/archive/1.8.zip and
  extract.

- Files in /bundled/ and /compressed/ directories are already
  compressed.  So make them as symlink to avoid minification again.