Fix php-mode ref
add base16-default theme

I used the [base16 builder][1] inspired by monokai theme
to provide values from base16.

[1]: https://github.com/chriskempson/base16-builder
Merge pull request #409 from farnoy/base16-default

add base16-default theme
File systems are now promisified
Hypothetically all code rewritten to use promises (100% untested).
Fixed first slew of obvious bugs.
Ready to dogfood
Version bump rename
Bugfixes in promise rewrite. Everything seems to work now.
Merge branch 'promise' of github.com:zedapp/zed into promise