added functions for placing many parameters in the anchor string

@Sebsauvage,

This pull request contains a few helper methods for using the anchor as a parameter string. I left out my integration with the JSON endpoint because I don't want to break the ZeroBin's PHP storage. You should be able to integrate the parameter code by changing the URL like so: http://ZeroBin.net/?5#key= -> http://ZeroBin.net/#key=ciphertextkey&cipherTextUrl=https_______). 

Privly's URL structure will be a bit more specialized, so unless you want to use Privly's URL structure, I am going to leave out those changes.

-Sean