git_hosting: added missing dep libicu, use version v0.6

* old master moved to v0.6, use that
Redmine 2.5 and related fixes

version change:
* 2.5.0
* postgres service task splitted because service starting wasn't working (why?)
* disabled redmine_didyoumean

redmine_dmsf changes for 2.5:
* 1.4.8 devel (2.5 fixes)
* use linux compatible xapian gem
* fix for SQL fail

other:
* update bundler gem to latest version
* fix permissions for plugins: set redmine_adm as owner
forgot redmine contacts file...
added gitolite tags and bugfixes for nginx reinstall task, bundler gem

* nginx was always reinstalled, condition added
* c&p error: "rake" changed to "bundler"