GUI-1088
re-factored EucaAuthenticator setup code.
added password field for IS create image warning dialog.
removed access key handling for bundling.
create 24 hour session creds and use for signing bundle upload policy
pep8 cleanup
more pep8 cleanup
GUI-1088
revised policy generation to split out token condition
merged develop
Merge branch 'develop' into GUI-1088.  Misc PEP8 cleanup.

Conflicts:
	eucaconsole/views/instances.py
Merge pull request #984 from eucalyptus/GUI-1088

Gui 1088 use session creds to sign upload policy. Also re-factored EucaAuthenticator setup code.