Update almost all gems

Note that the notifo notifier have been removed since the service do not exist anymore and it was pulling a lot of outdated gems.

before:
```
Outdated gems included in the bundle:
  * RubyInline (3.12.1 > 3.9.0)
  * activemodel (3.2.12 > 3.0.3)
  * activerecord (3.2.12 > 3.0.3)
  * activesupport (3.2.12 > 3.0.3)
  * addressable (2.3.3 > 2.2.8)
  * ansi (1.4.3 > 1.4.2)
  * arel (3.0.2 > 2.0.10)
  * aws-ses (0.4.4 > 0.4.3)
  * bcat (0.6.2 > 0.5.2)
  * builder (3.2.0 > 2.1.2)
  * bunny (0.8.0 > 0.6.0)
  * chronic_duration (0.10.2 > 0.9.6)
  * contest (0.1.3 > 0.1.2)
  * crack (0.3.2 > 0.3.1)
  * data_objects (0.10.12 > 0.10.8)
  * delayed_job (3.0.5 > 3.0.2)
  * delayed_job_active_record (0.4.3 > 0.3.2)
  * dm-serializer (1.2.2 > 1.2.1)
  * dm-types (1.2.2 > 1.2.1)
  * do_sqlite3 (0.10.12 > 0.10.8)
  * extlib (0.9.16 > 0.9.15)
  * haml (4.0.0 > 3.1.6)
  * hpricot (0.8.6 > 0.8.3)
  * httparty (0.10.2 > 0.4.5)
  * i18n (0.6.4 > 0.5.0)
  * json (1.7.7 > 1.6.7)
  * json_pure (1.7.7 > 1.6.7)
  * mail (2.5.3 > 2.4.4)
  * mime-types (1.21 > 1.18)
  * mocha (0.13.2 > 0.9.10)
  * multi_json (1.6.1 > 1.0.4)
  * nap (0.5.1 > 0.4)
  * nokogiri (1.5.6 > 1.4.4)
  * pony (1.4 > 1.1)
  * rack (1.5.2 > 1.1.0)
  * rack-test (0.6.2 > 0.5.7)
  * rake (10.0.3 > 0.9.2.2)
  * rr (1.0.4 > 1.0.2)
  * sass (3.2.6 > 3.1.18)
  * sexp_processor (4.1.5 > 3.2.0)
  * sinatra (1.3.5 > 1.1.2)
  * sqlite3 (1.3.7 > 1.3.6)
  * stringex (1.5.1 > 1.3.3)
  * tilt (1.3.4 > 1.3.3)
  * timecop (0.5.9.2 > 0.5.9.1)
  * treetop (1.4.12 > 1.4.10)
  * turn (0.9.6 > 0.8.1)
  * tzinfo (0.3.36 > 0.3.33)
  * uuidtools (2.1.3 > 2.1.2)
  * webmock (1.11.0 > 1.6.2)
  * xml-simple (1.1.2 > 1.1.1)
```

after:
```
Outdated gems included in the bundle:
  * RubyInline (3.12.1 > 3.9.0)
  * addressable (2.3.3 > 2.2.8)
  * builder (3.2.0 > 3.0.4)
  * sexp_processor (4.1.5 > 3.2.0)
```

All tests still pass.

Regards