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
fix(sortable): clear ui.item.sortable properties after drag stop
test(sortable): add tests for ui.item.sortable proper destruction
refactor(sortable): replace for-in-hasOwnProperty with angular.forEach

This also brings code coverage back to 100%.
feat(sortable): add extra properties to ui.item.sortable
tests(sortable): add tests for the properties of ui.item.sortable
Merge pull request #261 from thgreasi/extraProperties

feat(sortable): add extra properties to ui.item.sortable
tests: fix configuration of custom helper function + cancel() test
Merge pull request #262 from thgreasi/helperFuncTestFix

tests: fix configuration of "custom helper function + cancel()" test
docs(README): change dynamic nested tree helper repo link
Merge pull request #272 from thgreasi/readmeDynamicDirective

docs(README): change dynamic nested tree helper repo link
docs(API.md): add API.md explaining ui.item.sortable properties
Merge pull request #276 from thgreasi/extraPropertiesDoc

docs(API.md): add docs for ui.item.sortable extra properties
chore: update bower.json to allow angular#1.3
chore: increase version number to v0.13.0
Merge pull request #279 from thgreasi/v0.13.x-dev

chore: increase version number to v0.13.0 & allow angular#1.3
Merge pull request #280 from angular-ui/v0.13.x-dev

chore: merge V0.13.x dev into master