Make the generated number more visible.

I believe my bad eyes and bad light conditions of my office are not that
unique, so making the generated keys more visible could be useful.

And yes, 'font-family: monospace' is rather brutal thing, but I believe
it really helps
(http://www.joelonsoftware.com/uibook/chapters/fog0000000063.html)

Actually, after thinking about it and looking at how are numbers
presented on the Android Google Authenticatior
(https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2)
it seems to me that we can go all the way to xx-large.

Signed-off-by: Matěj Cepl <mcepl@redhat.com>
Fixed a small typo in about dialog; authentication
Merge pull request #18 from mcepl/more_visible

Make the generated number more visible.
Changed about links

Altered target for about links to open as _blank to meet the 'changed' Firefox Marketplace requirements.
Added wiki link

Added wiki link to Supported services
Added ignore files
Changed to gulp as build system (used to be grunt)
Fixed some errors reported by jshint
Changed node.js version (related to travis-ci)
Added livereload enabled server task
Added log entry for server task
Changed initial scale to 1
Merge remote branch 'upstream/master'