fixed erroneous callback function signature for the go_subscriptions_subscription_form shortcode
Merge pull request #40 from wluo/small-fixes

fixed erroneous callback function signature for the go_subscriptions_subscription_form shortcode
control the required fields by the 'sub_request' query var or shortcode attribute
renamed the style for the email field to 'required' so it can be used on other fields as well.
css update (generated from sass)
pass any shortcode attributes on to our filters; validation of advisory names
Merge pull request #42 from wluo/flock

sync flock to Gigaom
use a filter to get the label of the Company field in the sign-up form.
Merge pull request #43 from wluo/flock

use a filter to get the label of the Company field in the sign-up form.
use get_page_by_path() to check if an advisory name is unique or not; call the 'go_subscriptions_created_guest_user' filter after guest user creation to give go-advisories a chance to create a new advisory.
Merge pull request #44 from wluo/flock

use get_page_by_path() to check if an advisory name is unique or not
Blargh!
Merge pull request #45 from methnen/flock

Changing to an action because it's more appropriate.
Merge branch 'flock' of github.com:GigaOM/go-subscriptions into issues-4541-no-welcome-email
Modify step-1 sign-up form when it's shown to a signed-in, non-advisory user