hawk: Fixed loading main status page

This update fixes the following issue with hawk:
- bnc#800338: Force UTF-8 encoding to fix ActionView::TemplateError when loading main status page
- Workaround deprecated Gem::SourceIndex#add_spec (required to work with rubygems 1.8)

Fixed bugs
bnc#800338
Hawk: Internal Server error
Selected Binaries
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