bumping to 2.0.1
Merge branch 'master' of github.com:tenderlove/psych

* 'master' of github.com:tenderlove/psych:
  [#163] Add license to gemspec, is MIT
  * ext/psych/yaml/yaml.h: [DOC] fix typo by @GreenGeorge [Fixes GH-161]   https://github.com/tenderlove/psych/pull/161
* ext/psych/lib/psych/visitors/yaml_tree.rb: string subclasses should
  not be considered to be binary.  Fixes Psych / GH 166
  https://github.com/tenderlove/psych/issues/166

* test/psych/test_string.rb: test for fix

Fixes #166
* ext/psych/lib/psych/visitors/yaml_tree.rb: make less garbage when
  testing if a string is binary.
* ext/psych/lib/psych/visitors/to_ruby.rb: process merge keys before
  reviving objects. Fixes GH psych #168
* test/psych/test_merge_keys.rb: test for change
  https://github.com/tenderlove/psych/issues/168

Fixes #169
fix regexp for matching TIME.

fixes #171
fix support for negative years.

Fixes #168
bumping version
Add failing test for Struct references

The tests fails with

    Psych::BadAlias: Unknown alias: 1
Fix references for anonymous structs
fix typo

s/preceeded/preceded/
Merge pull request #173 from amatsuda/preceeded

fix typo in the code
Merge pull request #172 from splattael/struct-ref

Referencing anonymous structs fails with Psych::BadAlias Unknown alias
Psych.safe_load relies on ClassLoader without explicit dependency

I'm seeing the following when invoking `safe_load` in certain places:

NameError: uninitialized constant Psych::ClassLoader
# /Users/ben/.rvm/gems/ruby-1.9.3-p448/gems/psych-2.0.2/lib/psych.rb:286:in `safe_load'
Merge pull request #175 from benlangfeld/patch-1

Psych.safe_load relies on ClassLoader without explicit dependency
merging ruby trunk
* ext/psych/lib/psych/visitors/yaml_tree.rb: dumping strings with
  quotes should not have changed.  [ruby-core:59316] [Bug #9300]

* ext/psych/lib/psych.rb: fixed missing require.

* test/psych/test_string.rb: test
fix typo at https://github.com/ruby/ruby/pull/500 and https://github.com/ruby/ruby/pull/506
Merge pull request #180 from hsbt/fix-typo

backport ruby/ruby#500 and ruby/ruby#506
* ext/psych/yaml/emitter.c: merge libyaml 0.1.5
* ext/psych/yaml/loader.c: ditto
* ext/psych/yaml/parser.c: ditto
* ext/psych/yaml/reader.c: ditto
* ext/psych/yaml/scanner.c: ditto
* ext/psych/yaml/writer.c: ditto
* ext/psych/yaml/yaml_private.h: ditto