Replace Still Maintained status with Travis-CI.

http://stillmaintained.com/ shut down August 1, 2012.
Merge pull request #307 from glennpratt/travis-badge

Replace Still Maintained status with Travis-CI.
fix BaseNodeFilter.php NODE_PATH for Windows

On Windows NODE_PATH use ';' instead of ':' for separating paths in the NODE_PATH
Merge pull request #608 from sstok/patch-2

fix BaseNodeFilter.php NODE_PATH for Windows
fixed cloning of asset references
multiple clones should be additive
Merge branch '1.0.x' into 1.1.x

Conflicts:
	README.md
Merge branch '1.1.x'

Conflicts:
	src/Assetic/Filter/BaseNodeFilter.php