Capture for time signatures that indicate the location is open 24hours...

...or closed.

Fixes #887 

#### Closed
![closed-sunday](https://cloud.githubusercontent.com/assets/96776/4243604/b9af584a-3a10-11e4-8707-4274c99d638d.png)


#### Open 24hr
![open-all-day](https://cloud.githubusercontent.com/assets/96776/4243606/c0208b7c-3a10-11e4-84ac-7dfe49c413ca.png)


#### Normal hours
![open-monday](https://cloud.githubusercontent.com/assets/96776/4243630/edfe9f8e-3a10-11e4-898a-e73739720369.png)