Created getPaste(String key), improved getMostRecent and fixed some little bugs.

[felipeveigaramos]

[felipeveigaramos]

Created getPaste(String key) that retuns a PastebinLink using a pastebin key. Part of the Scraping API. Uses the pasteMetadata, presents in this API. But once through the PastebinLink is possible to get the full paste content, I prefered to change the name to getPaste.

The getMostRecent was also improved

There are two exception statement that need to be improved, at getMostRecent and getPaste. I'm not sure what would be the better way to work with them.