Merge branch 'release/1.2.1'

* release/1.2.1:
  Updating changelog.
  Version bump!
Merge branch 'develop'

* develop:
  Adding changelog.
  Bumping version.
  pep8 fix
  add tests dealing with proper subresource sanitization
  improve tests for provided-related functionality
  CollectionResource.create: correctly sanitize subresources
  add writable properties in ProviderData to writable_attrs
  changed Resource.get_resource_attributes() to be a static method
Merge branch 'develop'

* develop:
  New release!
Merge branch 'develop'

* develop:
  CustomData: don't sanitize values, they need to be sent as-is
add ability to reset account password in one request
small pep8 style fixes
Merge pull request #56 from denibertovic/password_reset

Password reset in one request