update diaspora package to 0.5.5

1. List out gems that needs update
2. Update gems and stage it in a personal repo
3. Update diaspora and test
4. Upload everything to experimental

Tasks:

[x] Fix favico.js regression in sprockets (worked around)
[ ] 

https://wiki.debian.org/Teams/Ruby/Packaging/newUpstreamRailsApp

@gem did you use any script last time?