Finished first pass on new navbar
Slightly smaller user profile image for nav dropdown
First pass on global nav mobile styles
Preserve order of tags as entered by the user.

Closes #3133
- Implement an ordered set for the tags property of the tag
  input controller.  Set order is by order added to the post.
Merge pull request #3434 from gleneivey/3431-run-with-latest-casperjs

Change casperjs helper used to get RSS page content.
Merge pull request #3430 from sebgie/refresh-token-expiry

Change refresh token expiry
Merge pull request #3435 from jaswilli/issue-3133

Preserve order of tags as entered by the user.
Error when inviting users

fixes #3433
- passing only the role ID when creating a user
- uncommenting test cases
Merge pull request #3437 from morficus/issue-3433

Error when inviting users
Implementing HTML emails

closes #3082
- no more in-line HTML strings
- adding files for "welcome", "reset password", and "invite user" emails
- added mail.generateContent() to create HTML and plain-text email content
- refactored methods that trigger emails to send both HTML and plain-text emails
Removing "author" role-label

closes #3427
- adding conditional statement to now display users with role "author"
Merge pull request #3421 from morficus/issue-3082

Implementing HTML emails
Merge pull request #3439 from morficus/issue-3427

Removing "author" role-label
Introducing new mobile header and more mobile nav components
Test for invite users error

refs #3433
Remove email address from frontend

closes #2330
- added deletion email address from post.author in front end
- updated tests
- with some refactoring this could be done on API level
Always hide horizontal scrollbars on body
Ignore GUI.css files
First pass of dropdowns
Add plural handlebars helper

Closes #3414

- Adds a helper which shows a select string deopending on the number of items provided

```
{{plural pagination.total empty='No posts' singular='% post' plural='% posts'}}
```
If `pagination.total` == 0, output 'No Posts'
If `pagination.total` == 1, outputs `1 Post`
If `pagination.total` ==  2 or more, outputs `2 Posts`

Credit to @sebgie for making this work.