Update Guzzle version to fix "Warning: count()..."

Merge pull request #148 from madikarizma/fix.guzzle-version-php-7

Update Guzzle version to fix "Warning: count()..."

Add some helpers to detect preview mode & experiment mode

Merge pull request #144 from gsteel/detect-preview-mode

Detect Preview or Experiment Mode

Add support for target blank

Merge pull request #142 from levimykel/target-blank

Add support for target blank

Fix asHtml for ordered list

Merge pull request #141 from levimykel/ol-fix

Fix ordered list bug

Remove symphony dependency

Merge pull request #139 from prismicio/sre/remove-symphony-deps

Remove dependency to symphony

Add composite slice support

3.3.0

add composite slice support

Add support for i18n

Merge pull request #133 from gsteel/fix-image-view-undefined-index

Fix ImageView undefined index

3.2.1

Fixes ref retrieving when using experiments.

3.1.0: Merge pull request #127 from dohzya/evo/add-getsingle

• Include helper for single custom types: getSingle()

Fix previews

Fix the previews, in the case where php replaces dot by underscore.