fix(sortable): manage appendTo option

appendTo option mess up ng-repeat comments
Merge pull request #263 from Intia/appendTo

fix(sortable): manage appendTo option
tests(sortable): add one more sorting to 'appendTo' test case
chore: increase version number to v0.12.11
Merge pull request #264 from thgreasi/master

chore: increase version number to v0.12.11
feat(sortable): update local variable with active options
feat(sortable): add workaround for horizontal lists
test(sortable): add tests for horizontal lists workaround
docs(README): add section about floating workaround & example
Merge pull request #266 from thgreasi/v0.13.x-dev

chore rebase to v0.12.11