[Improvement - LOW] Some minor corrections to the new Snow theme

If they are not clear then let me know and I can provide a before and after screenshot.

By the way, I'm not so sure it is a good idea to name the new Snow theme the same way as the old one. I'm thinking about someone making a plugin that checks for the Snow theme and then matching a different one.

I also think applying borders to every td is too much:
```
table tbody tr td {
	padding: 10px 0;
	border-top: 1px solid #ecf0f1;
	border-bottom: 1px solid #ecf0f1;
	display: table-cell;
}
```

Particularly after seeing how wide forms with labels are being displayed (horizontal lines both up and down on labels). Looks like it is too dense in horizontal lines. This includes plugins, profile section, admin permissions, etc. Not to mention the label for a tall checkbox does not have that because it is applies `border: none` in `td.qa-form-tall-label` so it is not always with the lines either so checkboxes for tall or wide make the impression that they are separators.

I'm attaching some screenshots of these 2 commits:
* Allowed new sections to be added to the right side of the profile section
* Removed the unnecessary white space in the profile section

Current state for a user profile that results in a lot of white space after the *type* field:
![1](https://cloud.githubusercontent.com/assets/1449790/4553651/f639ea22-4e9d-11e4-965a-210ae0b89821.png)

After removing the minimal height we can see the profile section is holding the components on the right, which will be annoying when trying to add new sections to the theme:
![2](https://cloud.githubusercontent.com/assets/1449790/4553650/f63809e6-4e9d-11e4-8f0c-ce3e3449e483.png)

After the fix:
![3](https://cloud.githubusercontent.com/assets/1449790/4553652/f63bc126-4e9d-11e4-8e48-230fce63f080.png)

Note the minimal height can be kept and the new sections will still be aligned because of the clear. However, I think the reason why the minimal height was there was to hold the components on the right.