Use sqlite_ext 1.5.0 in _all_ "Gemfile"s

Use sqlite_ext 1.5.0 which has been broadened to work with Ruby
versions prior to 2.x, and remember to add it to files in the
./gemfiles/ directory for use with CI tests, not just to
Gemfile in the root directory.

Gemfile

@@ -23,8 +23,11 @@ group :development, :test do
 end
 
 group :test do
-  gem 'sqlite3', :platform => [:ruby, :mswin, :mingw]
-  gem 'sqlite_ext', '~> 1.4.0', :platform => [:ruby, :mswin, :mingw]
+  platforms :ruby, :mswin, :mingw do
+    gem 'sqlite3'
+    gem 'sqlite_ext', '~> 1.5.0'
+  end
+
   gem 'webmock'
 
   platforms :ruby do

gemfiles/Gemfile.rails3.2

@@ -23,7 +23,11 @@ group :development, :test do
 end
 
 group :test do
-  gem 'sqlite3', :platform => [:ruby, :mswin, :mingw]
+  platforms :ruby do
+    gem 'sqlite3'
+    gem 'sqlite_ext', '~> 1.5.0'
+  end
+
   gem 'webmock'
 
   platforms :ruby do

gemfiles/Gemfile.rails4.1

@@ -23,7 +23,11 @@ group :development, :test do
 end
 
 group :test do
-  gem 'sqlite3', :platform => [:ruby, :mswin, :mingw]
+  platforms :ruby, :mswin, :mingw do
+    gem 'sqlite3'
+    gem 'sqlite_ext', '~> 1.5.0'
+  end
+
   gem 'webmock'
 
   platforms :ruby do

gemfiles/Gemfile.ruby1.9.3

@@ -8,6 +8,7 @@ group :development, :test do
   gem 'rubyzip'
   gem 'rails'
   gem 'sqlite3'
+  gem 'sqlite_ext', '~> 1.5.0'
   gem 'pg'
   gem 'mysql2', '~> 0.3.11'