add glyphicons font

[gamesover]

add glyphicons font since we don't want to change bootstrap sourcefile to correct font path

Kindly refer to https://stackoverflow.com/questions/18369036/bootstrap-3-glyphicons-are-not-working. There are two ways to fix the bootstrap fonts missing issue:

1. add external font file source like this fix
2. change

@font-face {
    font-family: 'Glyphicons Halflings';

    src: url('../fonts/glyphicons-halflings-regular.eot');
    src: url('../fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('../fonts/glyphicons-halflings-regular.woff') format('woff'), url('../fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('../fonts/glyphicons-halflings-regular.svg#glyphicons_halflingsregular') format('svg');
}

to

@font-face {
    font-family: 'Glyphicons Halflings';

    src: url('glyphicons-halflings-regular.eot');
    src: url('glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('glyphicons-halflings-regular.woff') format('woff'), url('glyphicons-halflings-regular.ttf') format('truetype'), url('glyphicons-halflings-regular.svg#glyphicons_halflingsregular') format('svg');
}

Because rails will auto go to fonts folder to find the fonts files. However, generally speaking, change directly to bootstrap sourcefile is not desired, do we?