Use https in submodule URL
Fixes issue #1: Change Twig::twig() to Twig::env()
try to create the directory before throwing an exception
add git extensions repository
add a simple way to load standard twig extensions
fix cache directory creation + remove unrelevant twig-extensions module
_init_cache function do not throw an exception anymore
update the error message into the exception concerning the cache directory
Merge pull request #2 from tchemineau/master

Try to create the cache directory before throwing an exception
Fix errors in README
Merge branch 'master' into 3.2/master

Conflicts:
	README.md