Use Issuer to select .well-known

For known list of BYU issuers ("https://api.byu.edu", "https://api-sandbox.byu.edu", and "https://api-dev.byu.edu"), auto-set the .well-known URL.

Multiple well-known keys

Do not break if well-known has multiple keys

Override well-known URL

Added option to override well-known URL. Useful for testing in local dev environments with web services that are not yet published

Using phpseclib

Some BYU server instances have some openssl quirks, so re-introducing phpseclib for openssl functionality

Claim parsing

Standard claims (e.g. 'http://byu.edu/claims/client_net_id') are parsed into hierarchal data and included in the "decode" output

Non-static

Static function calls are generally frowned upon, and also make thorough Unit Testing more difficult.
This new version converts static functions to instance functions.

Changing output format from object to array

Iterating through keys is much simpler with arrays than objects. So we're changing the output format.

Updated Unit Test config

No functional changes

Initial release

Basic functionality in place