Updated the Imagine library to version 0.4.0

The latest stable release of the Imagine library (v0.4.0) was recently released on packagist.org.
Fixed warning when an extension is not found from pathinfo().
Merge pull request #128 from thanosp/fix-extension-warning

Pathinfo-related notices in generateUrl()
Merge pull request #127 from ubick/patch-1

Updated the Imagine library to version 0.4.0
New minor Imagine versipon
Add image form type
Merge pull request #130 from EmmanuelVella/image-type

Add image form type
Merge pull request #129 from jcrombez/patch-1

New minor Imagine version
use source on travis, avoiding github api limits
remove deprecated entries in gitignore
update Imagine dependency to 0.4.* patch versions
Merge pull request #133 from havvg/master
Merge remote-tracking branch 'upstream/master' into post-processors

Conflicts:
	Resources/config/imagine.xml