When adding tile, display config icon only for configurable tiles
Auto add a column when adding a row (closes #212)
Updated documentation
Fixed CHANGES.rst
Updated test according to issue #212
Merge pull request #264 from collective/issue_212

closes #212
Merge branch 'master' into issue_204

Conflicts:
	docs/CHANGES.rst
Merge pull request #263 from collective/issue_204

closes #204
Merge branch 'master' into issue_262