Fix lookupCommand with multiple addon commands

Previously `lookupCommand` iterated through every addon with commands,
reassigning `addonCommand` for each one. As a result, having multiple
addons with commands installed would clobber lookup of all but the last
addon’s commands.

Now it breaks out of the loop as soon as it finds a matching command.
Merge pull request #2121 from jgwhite/lookup-command-patch

Fix lookupCommand with multiple addon commands
Fix two typos in the ember help generator command output
Add `before` and `after` options to insertIntoFile
Merge pull request #2123 from BastionFennell/master

Fix two typos in the ember help generator command output
Merge pull request #2122 from bantic/add-before-after-options-to-insert-into-file

Add `before` and `after` options to Blueprint#insertIntoFile
Generate pod components within components subdirectory.
Git based app blueprints

Extends `ember new'`s --blueprint option to accept git remotes in
either git@someservice.com:app-blueprint-test.git or
https://someservice.com/trek/app-blueprint-test.git style git remote
urls.
Merge pull request #2103 from trek/git-app-blueprints

WIP: Git based app blueprints
Merge pull request #2130 from kamalaknn/grp-pod-components

Generate pod components within components subdirectory.
Ensure that the app config does not get mutated by addons.
Merge pull request #2133 from rwjblue/ensure-app-config-wins

Ensure that the app config does not get mutated by addons.
[Bugfix] update CSP addon, it works now.
Merge pull request #2136 from stefanpenner/update-csp

[Bugfix] update CSP addon, it works now.
Update broccoli related dependencies.

Does not bring any symlinking, but does improve support in preparation.
Merge pull request #2138 from rwjblue/update-deps

Update broccoli related dependencies.
Bump RSVP version
Update CSP addon.

* Fix quoting issue with `self` and `none` default values (they must be
  quoted but they were not previously).
* Enable `unsafe-eval` when running in development environment. Required
  for use with `wrapInEval` (which defaults to "on" when running in
  development mode).
Merge pull request #2140 from thejchap/recursive-process-fix

Bump RSVP version
Merge pull request #2141 from rwjblue/update-csp-addon

Update CSP addon.