<div ng-controller="AboutController">
    <h2>About purkinje</h2>

    <div class="row">
        <div class="col-md-12">
            <p><a href="https://github.com/bbiskup/purkinje/">purkinje on github</a>
            </p>
        </div>
    </div>
    <hr>
    <div class="row">
        <button class="btn btn-default" ng-click="isLicenseCollapsed = !isLicenseCollapsed">{[licenseToggleText()]}</button>
        <div class="col-md-offset-1 col-md-6" collapse="isLicenseCollapsed">
            <ng-include src="'/static/templates/license.html'">
            </ng-include>
        </div>
    </div>
</div>

<div ng-controller="AboutController">
    <h2>About purkinje</h2>

    <div class="row">
        <div class="col-md-12">
            <p><a href="https://github.com/bbiskup/purkinje/" target='_blank'>purkinje on github</a>
            </p>
        </div>
    </div>
    <hr>
    <div class="row">
        <button class="btn btn-default" ng-click="isLicenseCollapsed = !isLicenseCollapsed">{[licenseToggleText()]}</button>
        <div class="col-md-offset-1 col-md-6" collapse="isLicenseCollapsed">
            <ng-include src="'/static/templates/license.html'">
            </ng-include>
        </div>
    </div>
</div>

Use blank target when referring to GitHub project page
Use blank target when referring to GitHub project page
