v2.2.2

This is a bug-fix release.

• composer improved html/plain switcher
• composer when focus on cc or bcc the contacts selector failed
• removed unused bootstrap css
• rollup now working in gulp (source builder related issue)

Since many like to give their releases a name (like: Apple or Ubuntu),
I will call this the De La Soul release:
"You wanna call me up? Take my number down. It's 222-2222"
https://www.youtube.com/watch?v=6-JOVXZePQk&t=1m15s