[added] The rule to check propTypes declarations sorting.

[AlexKVal]

Tests and Docs are included.

The jsx-sort-prop-types rule recognizes all supported patterns by this plugin
including those with ES6 classes syntax and static propTypes.

var Component = React.createClass({
  propTypes: {
    a: React.PropTypes.number,
    b: React.PropTypes.any
  }
...

class Component extends React.Component {
  ...
}
Component.propTypes = {
  a: React.PropTypes.any,
  b: React.PropTypes.string
};

class Component extends React.Component {
  static propTypes = {
    a: React.PropTypes.any,
    b: React.PropTypes.any,
    c: React.PropTypes.any
  }
  render() {
    return <div />;
  }
}

By default it is disabled.
Also it allows case ignoring.

Closes #38.

In the case this PR is merged it needs DRY refactoring.
(isPropTypesDeclaration() is the one to extract and isDisplayNameDeclaration() has similar code)

[coveralls]

Coverage increased (+0.21%) to 94.13% when pulling aebbcc4 on AlexKVal:38_sort_propTypes into 8624343 on yannickcr:master.

[yannickcr]

Great work!

Can you add the new rule in the Readme? Then I think we can definitely merge it.

[coveralls]

Coverage increased (+0.21%) to 94.13% when pulling 4c1a524 on AlexKVal:38_sort_propTypes into 76d5cd4 on yannickcr:master.

[coveralls]

Coverage increased (+0.21%) to 94.13% when pulling 4c1a524 on AlexKVal:38_sort_propTypes into 76d5cd4 on yannickcr:master.

[AlexKVal]

I've forgot it. My bad :)
I've added it as fixup into docs commit AlexKVal@d2676bc

[yannickcr]

Perfect, thanks!