Use session generated by DEA as sticky session

Instead of routers encrypt/decrypt the sticky session.

Change-Id: I8ef4891e336003aadca2cb84ee9390feb8239113
Add Path=/ explicitly to vcap session cookie

Without this the default is the path of the current request
so if user visits /foo/bar and then /bar he will get different
cookies, and if sticky sessions are in effect those requests
will land on different servers in the back end.

Change-Id: I009b74d33c77d5fb854006cc91582aa159aafcbd
Bump rake

Change-Id: I9d0c6ef7e9df0df1f5d9e0f6e80bc820a1afbd04
Add Travis configuration

Change-Id: Id2fd74034049c4d85379036991bbb4c43e1386fc
Merge pull request #1 from cloudfoundry/master

Merging from cloudfoundry trunk