Default SRID for PostGIS 2.0+ is 0
Simplify PostGISAdapter::postgis_lib_version
Remove Rails 3 test conditionals
Remove invalid test. postgis schema may not exist
Require ActiveRecord 4.1
Update create_table_definition, TableDefinition#initialize signatures
Use type_map
Update MiniTest base classes
Stop the Rakefile insanity

Use standard rake test tasks
Use standard bundler gem tasks
Use rgeo-ar gem

* rgeo-ar is the Neighborland fork of rgeo-activerecord that works with
AR 4.1
Fix test_basic_geography_sql_dump
Relax rgeo-ar dependency
Remove .ruby-version
Cleanup .gitignore, remove .ruby-version [ci skip]