Simplify server configuration - remove 'baseDir'

[shakyShane]

Projects that only use the baseDir option can safely promote it to being the value of server

server: {
  baseDir: "./app"
}

is exactly the same (to BrowserSync) as:

server: "./app"

This would not work should you wish to use any other server options in the future - but for the current configuration, it does make the gulpfile that little bit cleaner.

[addyosmani]

Thanks for the PR! Before this can be merged, please sign the CLA at https://developers.google.com/open-source/cla/individual

[shakyShane]

Done - maybe worth noting that I had previously done this... is it once per pull request now?

:)

[addyosmani]

Achievement unlocked: CLA signature found!

[sindresorhus]

Done - maybe worth noting that I had previously done this...

@addyosmani ?

[sindresorhus]

Thanks @shakyShane :)

[addyosmani]

Sorry for the automated CLA verified being a little on the fritz. Appreciate the fix!