fix(datepicker): memory leak fix for datepicker

Fixes #2658
Closes #2684
chore(release): 0.11.1
chore(release): Starting v0.11.2-SNAPSHOT

To fix a breaking change.
revert(dropdown): remove `C` restrictions to avoid conflicts"

Breaking change shouldn't go into patch release.

This reverts commit 7512b93fecb6f27df4f5aeba4c756c0c36aebbf2.

Fixes #2757

Fixes #2756
chore(release): 0.11.2
chore(release): Starting v0.12.0-SNAPSHOT
fix(dropdown): remove `C` restrictions to avoid conflicts

Fixes #2156

Closes #2170

BREAKING CHANGE: Both `dropdown` and `dropdown-toggle` are only attribute directives

Before:
  ```html
  <button class="dropdown-toggle" ...>
  ```
  After:
  ```html
  <button class="dropdown-toggle" dropdown-toggle ...>
  ```
Merging issue #2479 & #220 - Support template for Popover content
Merging issue #1915 - Performance fix for Datepicker
Merging issue #2148 & #590 - Add isOpen attribute to tooltip.
fix(datepicker) popup year/month selection closes popup, weeks display not resetting at 52
fix(popover) improving body click dismiss handlers
feat(modal) adding support for aside modal