Add a load of changelog entries

CHANGELOG.markdown

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+Version 2.0.0 (In Development)
+------------------------------
+
+Features:
+
+* Depends only on Active Record, not the whole of Rails
+
+* The Model.seed_many syntax is now supported by Model.seed, and Model.seed_many is deprecated
+
+* Model.seed supports adding multiple records without an explicit array argument. I.e. the following are equivalent:
+
+    Model.seed([
+      { :name => "Jon" },
+      { :name => "Emily" }
+    ])
+
+    Model.seed(
+      { :name => "Jon" },
+      { :name => "Emily }
+    )
+
+* A side-effect of the above is another option for single seeds:
+
+    Model.seed(:name => "Jon")
+
+* The `SEED` option to `rake db:seed_fu` is deprecated, and replaced by `FILTER` which works the same way.
+
+* Added `SeedFu.quiet` boolean option, set to `true` if you don't want any output from seed-fu.
+
+* Added `SeedFu.fixture_paths`. Set to an array of paths to look for seed files in. Defaults to `["db/fixtures"]` in general, or `["#{Rails.root}/db/fixtures", "#{Rails.root}/db/fixtures/#{Rails.env}"]` when seed-fu is installed as a Rails plugin.
+
+* Added `SeedFu.seed` method which is basically a method equivalent of running `rake db:seed_fu` (the rake task now just basically called `SeedFu.seed`)
+
+* Simplified and changed the `SeedFu::Writer` API, see docs for details
+
+Bug fixes:
+
+* Fix Rails 3 deprecation warnings and make seed-fu fully compatible with being installed as a gem