Register looked-up adapters/accessors in their own right

DataAccessor and InstanceAdapter classes are looked up for derived types
by inspecting the type's ancestors and searching for registered adapters
up the chain.

When loading a large number of facets this causes the lookup to be
invoked many times with the same arguments. By registering the located
adapter or accessor with the derived type, this is avoided for all calls
but the first.
Test that adapters found by ancestor lookup are registered.
Test adapter/accessor memoization using state checks
Clearer method naming in adapter lookup
Search all ancestors in adapter lookup
update jars and wars to solr 4.1.0
update jetty-specific config files
convenient install task for development
set version to 2.0.0.pre.experimental.solr4
try this with default logging
add context descriptor
update solr configuration to work with solr 4.1.  Most notable change is that the default core moves from /solr to /solr/default, due to the requirement in Solr 4+ to be multicore by default
fix typo
Merge branch 'master' of git://github.com/sunspot/sunspot

* 'master' of git://github.com/sunspot/sunspot:
  Sunspot 2.0.0.pre is now 2.0.0
  Update the Rakefile to run the tests for the current versions of Rails that we're testing against.
  add license information to gemspec
  Bump sqlite3 from 1.3.1 to 1.3.7
  Adds note to rake task informing user that it is destructive
Adds silence option to argument array, and better matching to answer

This commit adds a silence option for users that have automated this
task and want to skip the destructive prompt. It also changes the
matching of a user's answer to explicitally check for 'y'.
Merge pull request #322 from urbanautomaton/register-looked-up-adapters

Register looked-up adapters/accessors for later access
Merge remote-tracking branch 'fizx/solr4' into solr4

Conflicts:
	sunspot/lib/sunspot/version.rb
Use per-environment cores, and a default, with shared instanceDir and separate dataDir
Update Gemfiles to the latest Bundler requirements
Correctly prepare the Solr installation in an app for multicore