Rely on bundler for gem deps instead of geminstaller

ci/geminstaller.yml

@@ -1,30 +1,8 @@
 ---
 gems:
-- name: erubis
-  version: >= 2.6.5
 - name: geminstaller
   version: >= 0.4.3
-- name: fcgi
-  version: >= 0.8.7
-- name: memcache-client
-  version: >= 1.5.0
-- name: mocha
-  version: >= 0.9.8
-- name: mysql
-  version: >= 2.8.1
-- name: nokogiri
-  version: >= 1.3.3
-- name: pg
-  version: >= 0.8.0
-- name: rack
-  version: '~> 1.0.1'
-- name: rack-test
-  version: >= 0.5.0
-- name: rake
-  version: >= 0.8.1
-- name: sqlite3-ruby
-  version: >= 1.2.2
 - name: rubygems-update
-  version: >= 1.3.3
+  version: >= 1.3.5
 - name: bundler
   version: >= 0.6.0