Import many issues at once from a repository

![issues-7](https://cloud.githubusercontent.com/assets/623/3836676/198f412e-1dda-11e4-91c1-d63d8fc7ef8c.jpg)

![issues-5](https://cloud.githubusercontent.com/assets/623/3836660/9758f042-1dd9-11e4-9eaf-03696987081b.jpg)

![issues-6](https://cloud.githubusercontent.com/assets/623/3836665/d98f489e-1dd9-11e4-8fd0-56abf4cc5106.jpg)

Closes #42