Require all lib/ files for activerecord gems

Before, they were all missing their namesake file. Thus, bundler could not autorequire these gems.

````
bash-3.2$ gem install activerecord-jdbcpostgresql-adapter
Successfully installed activerecord-jdbcpostgresql-adapter-1.3.0
1 gem installed
bash-3.2$ irb
jruby-1.7.4 :001 > require "activerecord-jdbcpostgresql-adapter"
LoadError: no such file to load -- activerecord-jdbcpostgresql-adapter
	from org/jruby/RubyKernel.java:1054:in `require'
	from /Users/pivotal/.rvm/rubies/jruby-1.7.4/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:53:in `require'
	from (irb):1:in `evaluate'
	from org/jruby/RubyKernel.java:1093:in `eval'
	from org/jruby/RubyKernel.java:1489:in `loop'
	from org/jruby/RubyKernel.java:1254:in `catch'
	from org/jruby/RubyKernel.java:1254:in `catch'
	from /Users/pivotal/.rvm/rubies/jruby-1.7.4/bin/irb:13:in `(root)'
````