More functions added

* new getSchemasData function added to get schemas from a metro
* new getSchemaBySlug and getSchemaById  function added to search and
get schema by slug (tested) or by ID (no tests).
* new getNews function to get all the metro news
* new getEvents functions to get all the announcements about a metro
* apikey added as variable to use through all api calls.

Disclaimer: Some functions use "location" as argument for future
improvements, by now is useless. "since" argument no tested yet.
* Improvements over getNews function (gets more specific schemas data)
* theNews and theEvents function added (to print data from getNews and
getEvents)
* getTalks and theTalks functions added.
More examples

* Better css styles for examples
* More examples, one column for each example