Rewrite pieces of code deprecated by Django 1.7

The mimtype argument of HttpResponse, SimpleTemplateResponse,
TemplateResponse, and render_to_response was removed; one should
use content_type instead

Change-Id: I62214c37264845dbabf006a32616e894c4ac9e3a
Closes-bug: #1266676
Partially-impelements: blueprint django-1point6
Add volume extend functionality support

Cinder now has the ablity to extend a volume, This functionality
should be exposed through Horizon.

Change-Id: Iff26453fd0a83af97fad4adabbcd53f646a15e51
Implements: blueprint volume-extend
Fix inappropriate display for inf value of RAM and Storage.

Change-Id: Ie00fa5231648ddef359e42e7195836be10f77996
Closes-Bug: #1261462
Sync OPENSTACK_KEYSTONE_DEFAULT_ROLE with keystone

For now, keystone default role is _member_, while horizon set
OPENSTACK_KEYSTONE_DEFAULT_ROLE to Member. It will really be user
friendly to modify horizon default value to _member_ to sync with
keystone's default setting.

Change-Id: I55d15e6cfb74e52e933c5a44efd6c27930415738
Closes-Bug: #1264228
Make table_actions style work with buttons

Change-Id: I4470d50567e4fa92370ee8573047f5d717b74962
Closes-Bug: #1269653
Revert "JSHint integration"

This reverts commit 7711a78ac4365a04d49a69ca5238b7c2fc045f15.

Closes-Bug: #1270764
Change-Id: I259384716089b1cdb2c66e6777d54848de5fa58d
Merge "Fix inappropriate display for inf value of RAM and Storage."
Merge "Revert "JSHint integration""
Merge "Rewrite pieces of code deprecated by Django 1.7"
Merge "Add volume extend functionality support"
Merge "Sync OPENSTACK_KEYSTONE_DEFAULT_ROLE with keystone"
Merge "Make table_actions style work with buttons"