Fixed VOMS authN for non-RFC proxies
Small VOMS authN fix

Add only the first set of VOMS attributes to user's DN
Minor mixin fixes
Updated dependencies
Locked Sinatra version
Merge pull request #65 from arax/0.5.x

Fixed VOMS authN for some types of non-RFC proxies; fixed crashes on unknown mixins; updated dependencies
Removed support for Ruby 1.8.7 from docs
Added basic ON4.0 support
Updated Travis-CI configuration
Support for Ruby 2.0.0 is optional in 0.5.x
Basic contextualization support (based on OCCI-OS)
CONTEXT section is now optional (disabled by def.)
Small fix for CONTEXT section in compute
Updated authN rutines for ON 4+
Added debugging messages
Small fixes

* Debug messages for Basic/Digest
Fixed HTTP Basic Auth
Updated logging behavior
Minor version bump to 0.5.6
Small fix for user_data