Update pg dependency to version 0.12.1 (doesn't build on Ruby 1.8)

.travis.yml

@@ -1,9 +1,6 @@
 bundler_args: "--without assets:development:production"
 script: "bundle exec rake db:create db:migrate test"
 rvm:
-  - 1.8.7
   - 1.9.2
   - 1.9.3
-  - rbx
-  - ree
 env: "RAILS_ENV=test"

Gemfile.lock

@@ -97,8 +97,7 @@ GEM
     mime-types (1.17.2)
     multi_json (1.0.4)
     orm_adapter (0.0.5)
-    pg (0.12.0)
-      rake-compiler (~> 0.7)
+    pg (0.12.1)
     polyglot (0.3.3)
     rack (1.3.6)
     rack-cache (1.1)
@@ -130,8 +129,6 @@ GEM
       rdoc (~> 3.4)
       thor (~> 0.14.6)
     rake (0.9.2.2)
-    rake-compiler (0.7.9)
-      rake
     rdoc (3.12)
       json (~> 1.4)
     remotipart (1.0.1)

README.md

@@ -73,14 +73,8 @@ bug report should include a pull request with failing specs.
 This library aims to support and is [tested against][travis] the following Ruby
 implementations:
 
-* Ruby 1.8.7
 * Ruby 1.9.2
 * Ruby 1.9.3
-* [Rubinius][]
-* [Ruby Enterprise Edition][ree]
-
-[rubinius]: http://rubini.us/
-[ree]: http://www.rubyenterpriseedition.com/
 
 If something doesn't work on one of these interpreters, it should be considered
 a bug.