Wired up display sums menu item.

Put modal inits into an options dropdown directive. Not sure if that's the best thing to do but it felt right at the time.
Add toolbar styles

- added stylesheet toolbar.css.sass
- fixed some icon-font padding issues
- added active-button styles
- added a placeholder icon for filter-button
Merge pull request #1286 from opf/feature/toolbar-styling

Feature/toolbar styling
Merge pull request #1284 from opf/feature/ng-toolbar-display-sums

Wired up display sums menu item.
Wire up active button style for toolbar filter button
Merge branch 'dev-angular' of github.com:opf/openproject into dev-angular