Modify CSS classes on past foreign secretaries page to ensure correct al...

Modify CSS classes on past foreign secretaries page:
https://www.agileplannerapp.com/boards/105200/cards/6108

A previous pull request to add Philip Hammond as a the new foreign secretary has broken the alignment on this page. 

Because a picture is worth a thousand words...

Before this patch:
![screen shot 2014-09-26 at 16 02 20](https://cloud.githubusercontent.com/assets/5455804/4422667/534cbe2e-458e-11e4-9c2c-b0be5d8323f6.png)


After this patch:
![screen shot 2014-09-26 at 16 03 22](https://cloud.githubusercontent.com/assets/5455804/4422669/572455d4-458e-11e4-800f-0af8e870c308.png)