Skip dotfiles when generating assets
Enable URL lang parameter for switching languages (fixes #1080)
Update calmh/xdr
Use Go 1.4 'generate' to create XDR codec
Merge remote-tracking branch 'origin/pr/1086'

* origin/pr/1086:
  Enable URL lang parameter for switching languages (fixes #1080)
Run filetype and symlink integration tests with versioning (ref #1071)
Handle broken symlinks, Simple versioner (fixes #1071)
Handle symlinks, Staggered versioner (fixes #1071)