walker reports vm metadata
walker reports metadata for vapp
using git tag for vcloud-tools
vcloud-walker now depends on core
resolving conflicts
resolving conflicts
allowing user to dev/non-dev gem version using envvars

walker is not dependent on fog and vcloud-core. Using envvars to load
different versions of these gems. This switch is used normally during
developers
using new version of jeweller

using new version of jeweller to resolve conflict. This fixes following
dependecy conflict

Bundler could not find compatible versions for gem "nokogiri":
  In Gemfile:
    fog (>= 0) ruby depends on
      nokogiri (>= 1.5.11) ruby

    jeweler (~> 1.8.8) ruby depends on
      nokogiri (1.5.10)
added vcloud-core runtime dep in gemspec.
Merge pull request #35 from alphagov/reporting_vm_metadata

[Updated]walker reports vm & vapp metadata