use puma.

Using thin and unicorn is silly
Specify a version for puma and bundle
Fixes FeedService tests to actually test things.

The original tests stubbed the private methods which means they mostly
just tested ruby's precedence order. :) Private methods are forced
integrations... we have to allow them to operate in turn in order to
assess behavior.
Removing TestHelper from FeedService tests.

This removes the overhead imprint.

Tests run at quick speed:

$ rake test:file[test/services/feed_service_test.rb]
test/services/feed_service_test.rb
Rack::File headers parameter replaces cache_control after Rack 1.5.
Run options: --seed 41627

.....

Finished tests in 0.015902s, 314.4225 tests/s, 377.3070 assertions/s.
Fixes the tests so that they can execute on their own.

Speed benchmarks:

```
$ rake
test:file[test/services/subscriber_to_feed_data_converter_test.rb]

6 tests, 1 assertions, 1 failures, 5 errors, 0 skips
```

```
$ rake
test:file[test/services/subscriber_to_feed_data_converter_test.rb]

Finished tests in 0.005167s, 1161.2156 tests/s, 2128.8953 assertions/s.

```

Fair enough.
Adds rels for user profile links to followers, following, and updates.

According to ALPS, the following rels are used on <a> tags:

messages-me: Applied to an A tag. A reference to a list representation
of all the messages posted by the designated user.

users-friends: Applied to an A tag. A reference to list representation
of the designated user's friend users.

users-followers: Applied to an A tag. A reference to list representation
of the users who follow the designated user.
Merge remote-tracking branch 'upstream/use_puma'

Conflicts:
	Gemfile.lock
Merge remote-tracking branch 'wilkie/bugfix/feed-service-tests'
Merge remote-tracking branch 'wilkie/bugfix/subscriber_to_feed_data_converter_test-speed'
Merge remote-tracking branch 'wilkie/bugfix/alps-missing-rels'
Updates twitter gem.
Updates omniauth-twitter gem to first major version bump.
Upgrade mongo just because.