change root to home#index

because we need now the show for a page after signup
the landing_page will now home#index
introducing new home#show
introduce after sign-up
introducing after signup page

using locales for complete content
improve uri fetcher error handling

This includes some error classes, a default
no-redirections-limit constant (which uses the value 1)
and a specific TooManyRedirects error class, which also
contains the previous response which we received
before it all went to hell.
use uri fetcher in ontohub net

Also produce more useful error message inside
of the log (server-side).
provide useful error message to git-push user

When ssh-access querying for permissions fails
for HTTP related reasons the git-push user should be
informed of the situation instead of being attacked
by a ruby stacktrace.
Rails update.
Merge pull request #880 from ontohub/fix-rails-update

Rails update.
modify text according to the issue
remove developmentspecific raise
fixing tests
add safety-net error messages for ssh/git.
use STDERR consistently across git shell.
Merge branch 'staging' into 787-improve_ssh_access_error_handling

Conflicts:
	git/lib/git_shell.rb
Merge pull request #873 from ontohub/787-improve_ssh_access_error_handling

787 improve ssh access error handling
refer to wiki page on git/ssh access denied.
modify old rake task for new tree mechanism
adding migration for cleanup

to remove all old version edges there is an migration
Merge pull request #882 from ontohub/878-refer_to_wiki_on_access_denied

refer to wiki page on git/ssh access denied.