Removed images resource from api entrypoint for now

This resource has been removed and is provided by Tim now.
Tim is not properly mounted yet under api, but this will be
solved in an upcoming patch.
Fixed provider id on edit provider account page

@provider variable was not set properly, for some reason this worked
on master branch (older rails?) even if @provider was nil.
Fixed comparing of xml in rspec tests

Maybe it's caused by newer version of rails or some related gem, but
if I have a deployable like this:
'<deployable name="mock deployable"></deployable>'
then if this is processed by nokogiri (see method deployment.deployable_xml),
then it returns:
'<deployable name="mock deployable"/>'

On the other side, if I call '.inner_html' on:
'<deployable name="mock deployable"/>'
then it returns:
'<deployable name="mock deployable"></deployable>'

Solved by putting new line before '</deployable>'.
This format was used till now in deployable vcr cassette.
Fixed creation of redundant provider account when a deployament is created

Default instance factory is now associated with deployment,
but default deployment factory caused creation of another provider account
(new account is created for creating valid deployable with pushed provider
images). This patch creates some static (not ready to launch) deployable_xml
for default deployment which is sufficient for most cases.
Updated cuke provider account test to check properly deletion of selected account

Instad of checking total number of existing accounts after deletion tests
now check if particualr account exists or not.
Merge pull request #327 from jprovaznik/rebase_fixes

Rebase fixes