edx.org - revises registration h1 text to match the graphical banner texdt
edx.org - revises base blue and color references to adhere to WCAG color contrast guidelines
edx.org - revises login and register graphical banner images to include higher contrast between type and imagery
edx.org - adds in I18n syntax for login and register view page titles
Merge pull request #22 from edx/fix/btalbot/edx.org-accessibility

Fix/btalbot/edx.org accessibility