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 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
Update to Solr 4.2.0
Make sure travis is testing with rubygems < 2.0 for now
Clarify version support in Travis build matrix
Merge pull request #364 from fizx/solr4

Solr4 compatibility