Add networks

[GochoMugo]

Support the following networks:

• airtel
• orange

Refer to the Data File Format Specification. See the Safaricom data file.

Also,

• rename 'safaricom' to 'mpesa'

[kamikazechaser]

I will add orange and equitel soon

[GochoMugo]

@kamikazechaser I will be waiting. 👍