parseString and error handling

New function parseString which will return whole representation of XML as object. See readme for more detiles

BREAKING CHANGES
JS results array would include error as a first element of array and the actual result in the second element

HTML support added

Now you can make XPath queries to XML and to HTML as well

BREAKING CHANGES:
Previously used function find - now is queryXml. Use it as long with new function queryHtml

Remove strict dependency on React Native version

0.0.3

Remove strict version depencency from React

Fixed callback results

Fixed issue when only first result is returned to callback
Method name changed to 'find' for easier reference

First release

besick find functionality should work