update README
update vx-builder gem
catch exceptions in BuildNotifier#create_commit_status
fixed specs
create serializer for companies and include it to user serializer
user can change default company
remove github restriction
add config variable signup_disabled
Merge pull request #21 from vexor/readme

update README
Merge pull request #26 from vexor/change_companies

Change companies
new deploy

* update vx-builder gem
* remove artifacts support
* drop table artifacts
Merge branch 'new_deploy'
create integration spec for job_updater
update vx-builder gem
add role to UserCompany, remove schema.rb
add `index` and `update` action to api/users
add angular users controller, service, tests, route and template
fix project <-> identity association
fix tests for `Invite` model
add route, invites_controller and controller tests