remove rcov from Gemfile (we never used it); this makes rbx happy.  reverted back to using rbx on travis

…via DB=all bundle install, useful for development

Moving jasmine into the test group only breaks the jasmine rake tasks, so move it back to both test & development.

- Removed launchy since I couldn't find any use of it
- Ruby 1.9 seems to need em-synchrony explictly
- No need to recreate the Gemfile.lock on Travis if proper :platforms
options are used in the Gemfile
- Removed group :development, :test and moved the stuff in the
corresponding sections
- Install adapter Gems according to the env var DB, install al if it is
unset
- Merged database.yml.postgres into database.yml.example. Bonus point:
easier switching between mysql and postgres
- May break everything but lets see what CI says

Added Foreman gem.  Run Diaspora using `foreman start` (will start everything except mySQL.  Passing in a -p flag will let you specifiy the port.  Also: I took single_process_mode out of app config and made it an environment variable.  If you want to boot a lightweight server, run `SINGLE_PROCESS=true rails s`.

Fix a problem with re-saving deleted objects in a spec in postgres, add postgres to test group in gemfile

Use activerecord-import to re-save ServiceUser objects.  We should do the same in ReceiveLocalBatch.

This reverts commit 696779d5.

the connection adapter messes with single process mode...
This reverts commit dd752d7d.

thing. use built in resque inline method for single process mode