Replaces sendmail with direct

Closes #1538
* rips out sendmail
* adds direct
* updates nodemailer to 0.7.1
* changes unit tests for mail
* changed integration tests for mail
* adds mail api tests
Emberify Posts mobile transitions

Closes #3950

- Fixed up event attachment and removal in a few mixins
- Renamed content-list-content-view to something more understandable
- simplify transition from posts.index to posts.post
Change class for editor PSM closing transparent div

No issue

- Changes the class used by the transparent div used to close the PSM

Without this change, when in the editor and the nav is open, the transparent div here is above the div the nav is looking for. So, the div for the PSM is clicked, rather than the nav div.
Merge pull request #3915 from javorszky/iss1538b

Replaces sendmail with direct
Merge pull request #3999 from novaugust/emberify-posts-c-and-v

Emberify Posts mobile transitions
Merge pull request #4014 from PaulAdamDavis/fix-mobile-nav-click

Change class for editor PSM closing transparent div
Static nanoscroller integration

References #1892

A static integration of https://github.com/jamesflorentino/nanoScrollerJS  

This is WIP with the goal of getting feedback on and deciding how we should integrate this into Ghost.