Cleanup gemspec

* Add license
* Include .md files, not .rdoc, which no longer exist
* Make authors & email arrays
* Re-order things

rgeo-geojson.gemspec

@@ -1,20 +1,21 @@
 require './lib/rgeo/geo_json/version'
 
-::Gem::Specification.new do |spec|
+Gem::Specification.new do |spec|
   spec.name = 'rgeo-geojson'
   spec.summary = 'An RGeo module providing GeoJSON encoding and decoding.'
   spec.description = "RGeo is a geospatial data library for Ruby. RGeo::GeoJSON is an optional RGeo module providing GeoJSON encoding and decoding services. This module can be used to communicate with location-based web services that understand the GeoJSON format."
-  spec.version = RGeo::GeoJSON::VERSION
-  spec.author = 'Daniel Azuma, Tee Parham'
-  spec.email = '[email protected], [email protected]'
+  spec.authors = ['Daniel Azuma', 'Tee Parham']
+  spec.email = ['[email protected]', '[email protected]']
   spec.homepage = "http://github.com/rgeo/rgeo-geojson"
+  spec.license = 'BSD'
+  spec.platform = Gem::Platform::RUBY
 
-  spec.required_ruby_version = '>= 1.9.3'
-  spec.files = Dir["lib/**/*.rb", "test/**/*.rb", "*.rdoc", 'LICENSE.txt']
-  spec.extra_rdoc_files = Dir["*.rdoc"]
+  spec.files = Dir["lib/**/*.rb", "test/**/*.rb", "*.md", "LICENSE.txt"]
   spec.test_files = Dir["test/**/*_test.rb"]
 
-  spec.platform = ::Gem::Platform::RUBY
+  spec.version = RGeo::GeoJSON::VERSION
+
+  spec.required_ruby_version = '>= 1.9.3'
 
   spec.add_dependency 'rgeo', '~> 0.3'