Editorial cleanup
InvalidModificationError becomes AbortError (closes #191)
*Params params now *Options options (closes #195)

Makes the spec easier to write
Rewrote dial method (closes #193)

Abstracted away stuff that relate to the telephony service interacting
with network.
When serviceID not found, throw NotFoundError
Merge pull request #199 from marcoscaceres/DialMethodAndEditorial

Rewrote the dial method, renamed the dictionaries, moved some text around...