Bunches of styling updates

* tooltips are added
* Update font weight to match mocks (opensans-light)
* Make the email field immutable
* Focus the password field
* Remove the vertical scroll
* Use the newest connect-fonts, compress the fonts if needed
* Get rid of Google Chrome Frame for IE
* Add labels for screen readers
* Give the password field a blue outer box-shadow
* Make the password dots blue
* Give both buttons hover and focus states
* Center the buttons and input fields
* When buttons get too close together, put them on their own lines.
* Vertical alignment in the dialog and on mobile is a bit better
Use a slightly crisper Mozilla logo.
Merge pull request #62 from mozilla/styling

Bunches of styling updates