fix #969: ask the user if a wrong ssl certificate is detected

* replace HttpRequest by Volley
* default to https in case user forced ssl
rename some variables
use volley.RequestFuture instead of CountDownLatch to make the volley request synchronous
change ssl error message
max redirection naming
remove unused getHomePageLink
Merge branch 'develop' into issue/969-self-signed-ssl

Conflicts:
	src/org/wordpress/android/ui/accounts/SetupBlog.java
	src/org/wordpress/android/ui/accounts/WelcomeFragmentSignIn.java
	src/org/wordpress/android/util/HttpRequest.java
Merge branch 'develop' into issue/969-self-signed-ssl
fix bug preventing login with http auth
trust all ssl certificates only for domains user forced (xmlprc only)
allow webviews to bypass ssl errors for trusted domains
Merge pull request #982 from wordpress-mobile/issue/969-self-signed-ssl

fix #969: ask the user if a wrong ssl certificate is detected