Update livereload and CSP addons.

Allows livereload to work with any host (without CSP violations).
Update broccoli-concat to latest version.
Merge pull request #2306 from rwjblue/update-livereload-and-content-security-addons

Update livereload and CSP addons.
Update broccoli-caching-writer version to latest.
Update mocha-jshint to latest version.
Remove connect-livereload.

No longer used internally.
Update proxy-middleware to latest version.
Update semver to latest version.
Update supertest to latest version.
Update yuidocjs to latest version.
Merge pull request #2307 from rwjblue/update-deps

Update outdated dependencies.
vendorFiles should maintain its order even when it's overridden
Add ability to remove asset from vendorFiles by passing null
Merge pull request #2312 from Keoven/fix/vendor-files

vendorFiles should maintain its order even when it's overridden
Move bowerDirectory inside project
Merge pull request #2287 from quaertym/patch-13

Set bowerDirectory for project
improve .travis.yml

* force install of npm 2.x
* disable spinner
Update CHANGELOG

Through cf5f8edd1c1a5.
Bump version.
Bump broccoli-merge-trees version.

Properly uses `symlink-or-copy` to allow iteration for Windows users.