Store jetpack credentials on account objects
Treat post ID as long long

On blogs with really high post IDs (tumblr imports), postID could be a
negative number when converted to intValue, resulting in a false
`hasRemote`
Fixed reference to wpxmlrpc and updated pods
Added a shortcut to add posts/pages from sidebar

props maxday, fixes #1628
Tweaked add button position. refs #1628
Merge branch 'master' into accounts
Make sidebar talk to WPAccount instead of the API