Added Standalone base class

This release add a new Standalone base class, which is ideal to render small LaTeX snippets.

Symfony 4 support

This release should fully support Symfony 4.

• Added autowiring possibility for LatexGenerator class
• Moved to namespaced Twig template annotation
• Updated package requirements

PHPDoc fix

Update LatexInterface.php to fix phpdoc (#25)

A value can be any type, so it should be `@param mixed $value`

Fixed special char parsing

In v1.2.0 an error got included, causing certain escaped to be replaced twice. This patch release fixes that.

Added new options to the LaTeX Parser

v1.2.0

Fixes #20. Add support for more characters by adding parser options

Fixes weird space errors

v1.1.3

Updated weird space parsing

v1.1.2

Updated HOME variable to /tmp for reuse and portability.

v1.1.1

• Return LatexGenerator on settings update
• Added method to set the cache directory in the LatexGenerator class

v1.1.0

Changelog:

• Fixes #21: Added timeout configuration
• Fixes #18: Added extra parameter for the cache dir

v1.0.1

Fix bug and update documentation