Email testing and web font support

Fixed a few bugs and implemented email testing.

• Fix error in JSON watch path
• Update partials watch path to account for nested partials
• Implement Nodemailer and Grunt send task (thanks to @dwightjack and his Grunt Email Boilerplate for inspiration)
• Updated the htmlbuild task and tags to have the basic stylesheet also printed out in a <style> tag, allowing for usage of web fonts and other things that get stripped