Added tasks dir to gem

This should fix issues:

  * mauriciozaffari/mongoid_search#58
  * mauriciozaffari/mongoid_search#61
Merge pull request #62 from spk/gem_add_tasks

Added tasks dir to gem
add support jruby
Merge pull request #68 from mimosa/master

Add support for jruby
Proper gemspec for jruby
Don't include Gemfile.lock in the repo
Use correct platform in gemspecs
Fix Gemfile to work with multiple gemspecs
Added Hash field to example documentation.
Merge pull request #70 from nosolosoftware/master

Added Hash field to example documentation.
Merge pull request #69 from johnae/master

Proper support for jruby
Eager-load models in the rake task.

In Rails 4, models are no longer automatically eager-loaded within Rake tasks.
This addresses one of the issues mentioned in #67 (`uninitialized class
variable @@classes`).
Merge pull request #73 from smashwilson/eagerload

Eager-load models in the :index rake task.
Merge remote-tracking branch 'upstream/master'