Added stacks to front page
Icon for stacks
stacks: fix handling of elements inside links.
Stacks: add tests
Revert "Revert "Merge pull request #350 from Patternslib/pat-stacks""

This reverts commit 5d9643329e77cdc4d704020df3acdb562b9f57d6.
Merge branch 'pat-stacks'