Added Cilex and Pimple support (#15)

* Added Cilex and Pimple support

* Version Bump to 2.1.0

Support silex 2 / pimple (#12)

* Support silex 2 / pimple

* Document silex and this provider versions

Since silex 2 / pimple 3 providers are not compatible with version 1 of silex, make sure to document it in the readme and point silex 1 users to the correct branch.

Merge branch 'master' of github.com:aws/aws-sdk-php-silex

Merge pull request #9 from jeskew/feature/psr4-the-tests

PSR4 all the things

Merge pull request #8 from jeskew/feature/upgrade-to-V3

Update provider to use V3 of the AWS SDK

Fixed composer.json requirements and brought module up-to-date

Not passing in a config no longer triggers an error.

Updated provider to inject the Silex version number into the user age…

…nt string for requests to AWS.