split integration test rake task

now we have separate rake tasks to run integration tests for ci and
development
rake integration:ci skips the manual and time consuming integration
tests.
rake integration:all runs all the integration tests
added skip_in_ci tag to manual tests
renaming specs to have suffix _spec
renaming targets

We want the quick tasks for running in development, as you need quick
feedback while writing code, but CI can run the long tasks because it's
an asynchronous job, plus we want CI to tell us that nothing at all has
broken with the build.
Merge pull request #109 from alphagov/rspec_tagging

Rspec tagging