feat(e2e): blog list e2e tests

LBSD-233 LBSD-217
fix(e2e): btoa the autorization header.

LBSD-217
fix(e2e): prepopulation payload; error reporting on bad auth; reverted removed workaround for page reload
fix(tests: e2e): removed testing instances' URLs from protractor config
fix(e2e: blog-list): don't need to wait there when synced to angular
style(e2e: blog-list): fixed indent
feat(e2e): added few helpers from superdesk
Merge pull request #18 from actionless/e2e-blog-list

fix(e2e)