Use the new build env on Travis

faster vms, more ram, more cpu, better network

docs coming soon
Merge pull request #57 from joshk/patch-1

Use the new build env on Travis
Add experience_profile_id to Payment
Merge pull request #64 from peterkovacs/payment-experience-profile-id

Add experience_profile_id to Payment
Merge branch 'stable'
merge unmerged files
resolve merge conflicts
update travis CI configuration
Merge branch 'v0.8.1' into stable
update travis CI configuration
Merge branch 'v0.8.1' into stable