Allow purely shell based deploys. (#98)

This PR modifies Piku such that if the user has a `web` and a `release`
worker defined it will allow the deploy to continue. This is useful in
cases where the user wants to run some binary server.

An example is the gitea deploy. Without this change it needs a
superfluous requirements.txt file exists before it will deploy. If/when
this is merged I'll update the deploy-gitea repo to remove that
superfluous file.

Another fun thing this would allow is tiny web services written with
bash/netcat etc.

piku.py

@@ -342,6 +342,8 @@ def do_deploy(app, deltas={}, newrev=None):
             elif (exists(join(app_path, 'Godeps')) or len(glob(join(app_path,'*.go')))) and check_requirements(['go']):
                 echo("-----> Go app detected.", fg='green')
                 settings.update(deploy_go(app, deltas))
+            elif 'release' in workers and 'web' in workers:
+                echo("-----> Generic app detected.", fg='green')
             elif 'static' in workers:
                 echo("-----> Static app detected.", fg='green')
                 settings.update(deploy_identity(app, deltas))
@@ -539,12 +541,14 @@ def deploy_python(app, deltas={}):
         call('pip install -r {}'.format(requirements), cwd=virtualenv_path, shell=True)
     return spawn_app(app, deltas)
 
+
 def deploy_identity(app, deltas={}):
     env_path = join(ENV_ROOT, app)
     if not exists(env_path):
         makedirs(env_path)
     return spawn_app(app, deltas)
- 
+
+
 def spawn_app(app, deltas={}):
     """Create all workers for an app"""