Update README

Add a "how to generate a pdf document from a twig view" section in the README file
Added another method to be able to set options

Not sure why something so simple but necessary is missing from this interface to Snappy. 
I just added a new option to be able to set options before generating the PDF document.
allow to configure env variables via semantic configuration
Merge pull request #25 from lucascourot/patch-1

Update README
Merge pull request #28 from t3chn0r/patch-1

Added another method to be able to set options
Remove old stuff from the readme
Syntax highlighting on README.md
fix require in README.markdown
Merge pull request #37 from mhor/patch-1

Syntax highlighting on README.md
Update composer.json

added a branch alias
Merge pull request #41 from sstok/patch-1

add a branch alias to composer.json
Changed sprintf to vsprintf to handle arrays that are passed to it. This is to support the commit from the pull request: https://github.com/KnpLabs/snappy/pull/75 that handles multiple inputs.
Check if  $input is an array and if so flatten to string so sprintf works.
Changed the debug $input to $debug_input so as to not overwrite $input.
Updated with usage.
Merge pull request #46 from seangofus/master

Handle array of inputs in LoggableGenerator.php
Fix missing "extra" node for branch alias

The branch alias doesn't appear on packagist. This could help :)
Merge pull request #49 from devster/patch-1

Fix missing "extra" node for branch alias
Add var_export for logging
Merge pull request #56 from KnpLabs/fix/logging-array-of-values

Add var_export for logging