Hi,
Adobe Muse CC 2014.1 (released earlier today) includes support for self-hosted web fonts. To use a specific font in your Muse site (such as Roboto), you will need to install the system font (properly licensed for desktop use) and provide the corresponding web font files (properly licensed for use on a website). In this case, Muse will not export your font as an image.
Give it a try and let us know if you need help or run into issues.
Abhishek