don't mess with LOAD_PATH!
don't construct path to sdoc to require it, it should be in load path

Conflicts:
	lib/rdoc/discover.rb
no need to use json_pure for jruby as there is java version of json gem + version is already in spec

Conflicts:
	sdoc.gemspec
don't require rubygems, rdoc version is already in spec

Conflicts:
	lib/sdoc.rb
slim discover.rb

Conflicts:
	lib/rdoc/discover.rb
unifying require