feat(toolbar): add button to hide/show toolbar

menu.jade:
* Add toggle button to toolbar
* Add container to hide the rest of toolbar without hiding the toggle
button.

menu.styl:
* Add toggle button styles
* Update toolbar styles to account for toggle button

header.styl:
* Update rules for adding and removing padding from .header-wrap when
toolbar is toggled.
Merge pull request #3402 from benmanley/toolbar-toggle

feat(toolbar): add button to hide/show toolbar
fix(mobile): export i18n for mobile so it can temporarily use en translations
fix(profile): fix profile classes for mobile include
feat(stats): expos stats jade files to mobile
feat(filters): add button to hide tags and restyle

**filters.styl**
* restyle tags and filter controls using global styles
**filter.jade**
* add button to toggle visibility
* change controls from icons to text
**global-modules**
* add new extends and mixins for button bar and tags
**global-colors.styl**
* add tag colours
refactor(tasks): restyle task column color scheme