* feat(split-panel): split panel support for ion-nav and ion-menu
Revert some changes
adds support split-panel support for tabs
Removes .orig
removes e2e.ts
Removes unneeded changes in menu.ts
improves stuff
* fix(split-panel): resize is called when menu wraps a ion-nav
* test(split-panel): improves split-panel/basic test
* feat(split-panel): ionChange is an ng2 @Output()
* fix(split-panel): fix tabs as side content
* fix(menu): forzedClose works as expected
* feat(split-panel): split-panel works with several menus
* chore(split-panel): renames to split-pane
* refactor(split-pane): splitPane can be injected
* fix(split-pane): it is a directive
* fix(slides): integration with split-panel
* Make gulp validate happy
BREAKING CHANGES:
- `<button>` becomes `<button ion-button>`
- `<a button>` becomes `<a ion-button>`
- `<button ion-item>` does not get the `ion-button` attribute
- Buttons inside of `<ion-item-options>` do get the `ion-button`
attribute
- Removed the `category` attribute, this should be passed in
`ion-button` instead.
- Button attributes added for icons in buttons: `icon-only`,
`icon-left`, and `icon-right`
closes#7466
