Provide local CSS when external CDN fails

[ryanjohara]

Fixes #352

Signed-off-by: Ryan O'Hara oharar@email.chop.edu

[coveralls]

Coverage remained the same when pulling f98b8f8 on ryanjohara:issue-239 into 1588a48 on cbmi:master.

[naegelyd]

I think this can be chained like this:

var local_bootstrap = document.createElement('link');
    .setAttribute('rel', 'stylesheet');
    .setAttribute('type', 'text/css');
    .setAttribute('href', '/static/stylesheets/css/' + cssStyles[cs]);

[coveralls]

Coverage remained the same when pulling 10a273b on ryanjohara:issue-239 into 1588a48 on cbmi:master.

[coveralls]

Coverage remained the same when pulling 10a273b on ryanjohara:issue-239 into 1588a48 on cbmi:master.

[coveralls]

Coverage remained the same when pulling 10a273b on ryanjohara:issue-239 into 1588a48 on cbmi:master.

[naegelyd]

I believe the cssLoaded method can be removed and this code should be simplified into:

var requiredCSS = ['bootstrap.css', 'bootstrap-responsive.css', 'font-awesome.css'],
    loadedCSS = document.styleSheets,
    isLoaded;

for (var i = 0; i < requiredCSS.length; i++) {
    isLoaded = _.some(loadedCSS, function(sheet) { 
        return sheet['href'].indexOf(requiredCSS[i]) >= 0; 
    });

    if (isLoaded) continue;

    var localLink = document.createElement('link');
        .setAttribute('rel', 'stylesheet');
        .setAttribute('type', 'text/css');
        .setAttribute('href', '/static/stylesheets/css/' + requiredCSS[i]);
    document.getElementsByTagName('head')[0].appendChild(localLink);
}

[ryanjohara]

The original fix is actually broken. The test I used must not have been comprehensive. I was also unable to get the .setAttribute chaining to work - ugh. I'm going to close this PR and look into another solution.