Update CREATE EXTENSION to include IF NOT EXISTS
Support ruby 2.1.0, add to Travis
Drop support for Rails 3.x, ruby 1.x, PostGIS 1.x
Update Gemfile, drop jruby
Add LICENSE.txt, move license to single file
Require ruby 2.0
Drop support for PostGIS 1.x
Remove rails 3 & jruby support, whitespace
Simplify version handling

Conflicts:
	activerecord-postgis-adapter.gemspec
Add history notes
Remove unused railtie file
Remove rakefile_config.rb
Remove AR version checks
Remove activerecord from Gemfile (in gemspec)

Conflicts:
	activerecord-postgis-adapter.gemspec
Simplify file lists in gemspec
Default SRID for PostGIS 2.0+ is 0
Simplify PostGISAdapter::postgis_lib_version
Remove Rails 3 test conditionals
Fix gemspec merge
Stop the Rakefile insanity

Use standard rake test tasks
Use standard bundler gem tasks