updating GCE to use v1beta16, since v1beta15 is now deprecated
avoiding race condition on assigning to @nodes
added missing docstring, and always returning a list of nodes
correctly detecting the EBS mount point when running on Xen paravirtualized hardware in AWS
allowing root connections on celery workers
add X-Forwarded-Ssl and X-Forwarded-Proto headers when accessing app through ssl

this allows the app to detect if the user accessed it using http or https
Merge pull request #797 from simplysoft/nginx_x-forwarded-ssl

Add X-Forwarded-Ssl and X-Forwarded-Proto for better SSL support
always set x-forwarded-proto and ssl to prevent malicious overwritting
always erasing local appcontroller state when tearing appscale down
removed ok_to_fail, since it was not being used
not retrying infinitely on timeout errors
rewrote documentation on make_call
removed unnecessary argument off of soap call
using all database peers when connecting to pycassa, instead of just localhost
making sure that zookeeper owns all folders in the zookeeper directory, not just the directory itself
Merge pull request #799 from simplysoft/nginx_x-forwarded-ssl

Prevent malicious overwriting of x-forwarded-proto and ssl
Merge pull request #805 from shatterednirvana/ensure-permissions-are-set-on-zookeeper

Making sure that zookeeper owns all folders in the zookeeper directory
Merge pull request #791 from shatterednirvana/gce-v1beta16

Updating GCE to use v1beta16, since v1beta15 is now deprecated
Merge pull request #800 from shatterednirvana/erase-local-state-on-down

always erasing local appcontroller state when tearing appscale down
Merge remote-tracking branch 'origin/use-right-disk-in-xen-pv' into baz