Update Burlington Ruby Conference description.

Expand upon Burlington Ruby Conference description in the conferences index
based upon the comment by @stomar in #563
Use named references for documentation page in ja
Merge pull request #606 from brettchalupa/patch-1

Update Burlington Ruby Conference description.
Merge pull request #607 from makimoto/named-refs-in-documentation-ja

Use named references for documentation page in ja
Fix wrong news post filename (zh_tw)