{{gh-path}} Handlebars helper, returning paths

- Uses utils/ghost-paths to resolve paths
- {{gh-path}} or {{gh-path ‘blog’}} for Ghost’s root (mysubdir/)
- {{gh-path ‘admin’}} for Ghost’s admin root (/mysubdir/ghost)
- {{gh-path ‘api’}} for Ghost’s admin root (/mysubdir/ghost/api/v0.1)
Incrementing hard limits for Meta title and Meta description

closes #4124
- incremented values for client-side validation for Meta title and Meta description
- changed error messages to display the maximum number of characters.
Rewrite publish bar markup

Closes #4123, closes #4114, references #4105

- Rewrite to use flexbox for über mobile goodness
- Fixes tag suggestions (using the new dropdown style)
- Fixes vertical alignment
Update icons
Merge pull request #4137 from JohnONolan/icon-refresh

Update icons
Updated dropdown component style
Merge pull request #4128 from PaulAdamDavis/fix-tags-input

Rewrite publish bar markup
Merge pull request #4126 from mattiascibien/issue-4124

Incrementing hard limits for Meta title and Meta description
Merge pull request #4139 from JohnONolan/dropdown-refresh

Updated dropdown component style
Static page and feature options in new PSM

closes #4109
- Add featured option
- Move static page/featured to other place
- Change wording on static page
Merge pull request #4111 from halfdan/4109-psm

Static page and feature options in new PSM
Implements setting specific body classes

closes #4116
- Adds css classes to settings views
Fix publish bar tag scrolling div

Continues on from #4128

- Increases height of tags div and adds `overflow-y: hidden;` to its parent
Fix button class on upload modal

no issue

- this makes sure that the cancel button on the upload modal gets the
  correct class
Merge pull request #3824 from felixrieseberg/iss3718-2

{{gh-path}} Handlebars helper, returning paths
Merge pull request #4143 from ErisDS/modal-button

Fix button class on upload modal
Merge pull request #4142 from PaulAdamDavis/fix-publish-bar-tags

Fix publish bar tag scrolling div
Enable cycling header levels with ctrl+h.

closes #3019

* Remove preexisting `ctrl+h` keymap.
* Add logic to cycle the header level.
  * Loops around after h3.
  * Sets cursor position to end of heading
  * Set initial level to h2.
* Remove `ctrl+alt+${NUM}` keymaps (as they do not work
  internationally).
Updating markdown help modal with new shortcuts

issue #3019
Undisable nProgress

Closes #4095

* Removes the line that killed nProgress for PSM
* adds to styles to make nProgress appear again (ht @halfdan)

IRC: http://107.20.237.151:8081/logs/%23ghost/20140922#pm51214