Simple SMS

##Change Log

####2.1.1

Updated Twilio dependency.

####2.1.0

Fixed doc blocks --Thanks Ellrion
Created Driver Manager class to better manager drivers. --Thanks Ellrion
Added LabsMobile driver --Thanks borislalov
Added Nexmo driver --Thanks cricu
Added ability to switch drivers at runtime.
Fixed a bug when the queue method is called upon.

####2.0.0

Full Laravel 5.X support.
Updated to Guzzle 6.
Dropped support for PHP 5.4
Added the ability to send SMS messages without a view.
Fixed typos in the read me file.

####2.0.0-Beta1

Adds support for Laravel 5

####1.1.0

Added MMS support for Twilio.
Corrected some typos in the readme.

####1.0.0

Removed unstable development warnings.
Basic doc cleanup.

####Beta 1

Dropping receive support for CallFire due to not being able to get a keyword to test.
Dropping support for Mozeo receive due to not being able to get an API link forwarding set up automatically.

####Alpha 3

General comment and code clean up.

####Alpha 2

Expanded documentation.
EZTexting now supports checking for messages.
CallFire now supports checking for messages.
Added error detection on API calls.
Push SMS Messages now work with EZTexting.
Push SMS messages now work with Twilio.
SMS::queue now works.
Added EZTexting Driver
Added CallFire Driver
Added Mozeo Driver
Fixed a bug where the pretend configuration variable was not working.
The E-Mail Driver will now throw an error if a carrier is not found or provided.
SMS::pretend() now works as documented.