Remove possibility to use postgres-pr

It is no longer maintained and doesn't work with current PostgreSQL versions.

Gemfile

@@ -2,6 +2,3 @@ source "https://rubygems.org"
 
 # Specify your gem's dependencies in pg_ldap_sync.gemspec
 gemspec
-
-gem "pg", require: false
-gem "postgres-pr", require: false

README.rdoc

@@ -32,28 +32,24 @@ It is meant to be started as a cron job.
 
 == REQUIREMENTS:
 
-* Ruby-1.8.7, Ruby-1.9.2, JRuby-1.2, Rubinius-1.2 or better
-* Rubygems-1.3.5+
+* Ruby-2.0+, JRuby-1.2, Rubinius-1.2 or better
 * LDAP-v3 server
-* PostgreSQL-server v8.1+
+* PostgreSQL-server v9.0+
 
 == INSTALL:
 
-Install Ruby and rubygems:
+Install Ruby:
 * on Windows: http://rubyinstaller.org
-* on Debian/Ubuntu: <tt>apt-get install ruby rubygems</tt>
+* on Debian/Ubuntu: <tt>apt-get install ruby libpq-dev</tt>
 
-Install pg-ldap-sync and a database connector for PostgreSQL:
-  gem install pg-ldap-sync pg
-You may also use the pure ruby postgres-connector which is less mature,
-but doesn't need compilation:
-  gem install pg-ldap-sync postgres-pr
+Install pg-ldap-sync and required dependencies:
+  gem install pg-ldap-sync
 
 === Install from Git:
   git clone https://github.com/larskanis/pg-ldap-sync.git
   cd pg-ldap-sync
-  gem install hoe
-  rake install_gem
+  bundle
+  rake install
 
 == USAGE:
 

lib/pg_ldap_sync/application.rb

@@ -6,29 +6,7 @@ require 'optparse'
 require 'yaml'
 require 'logger'
 require 'kwalify'
-
-begin
 require 'pg'
-rescue LoadError => e
-  begin
-    require 'postgres'
-    class PG
-      alias initialize_before_hash_change initialize
-      def initialize(*args)
-        arg = args.first
-        if args.length==1 && arg.kind_of?(Hash)
-          initialize_before_hash_change(arg[:host], arg[:port], nil, nil, arg[:dbname], arg[:user], arg[:password])
-        else
-          initialize_before_hash_change(*args)
-        end
-      end
-    end
-  rescue LoadError
-    raise e
-  end
-end
-
-require 'pg_ldap_sync'
 
 module PgLdapSync
 class Application

pg-ldap-sync.gemspec

@@ -21,6 +21,7 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency "net-ldap", "~> 0.2"
   spec.add_runtime_dependency "kwalify", "~> 0.7"
+  spec.add_runtime_dependency "pg", ">= 0.14", "< 2.0"
   spec.add_development_dependency "ruby-ldapserver", "~> 0.3"
   spec.add_development_dependency "minitest", "~> 5.0"
   spec.add_development_dependency "bundler", "~> 1.16"