system groups - allow user to change env/view for selected systems

Prior to this commit, we added to the UI the ability for
a user to 'edit' the environment and content view associated with
all systems in a system group.  This commit will extend that so
that if the user selects a few systems from the group, they
can edit only those systems.
system groups - add test for handling edit on selected systems
katello-configure - scl prefix for working with software collections
Fixing Rails 3.2 deprecations
Removed unnecessary line from Travis config
Merge pull request #1873 from iNecas/kc-scl_prefix

katello-configure - scl prefix for working with software collections
katello-configure - fix running foreman-config for scl
Merge pull request #1875 from iNecas/foreman-config-cwd

katello-configure - fix running foreman-config for scl
run rake tasks from upgrade script in SC environment
Merge pull request #1876 from xsuchy/pull-req-rake56

run rake tasks from upgrade script in SC environment
Merge pull request #1872 from daviddavis/rails32_deprecations

Rails 3.2: Fixing deprecations
Merge pull request #1874 from daviddavis/rm_travis_env

Removing line we no longer need from Travis config
Merge pull request #1868 from bbuckingham/fork-system_groups

system groups - allow user to change env/view for selected systems
fixing rubygem(foreman-katello-engine) requires
Merge pull request #1878 from jlsherrill/scl_fix

fixing rubygem(foreman-katello-engine) requires