Removed dashes from property names corresponding to feature detects.

The dashes were preventing these detects from being queried like every other detect. For example, before this PR one could use

```
if (!Modernizr.fontface) { /* (...) */ }
```

to test for `@font-face` support, but one must use

```
if (!Modernizr["display-table"]) { /* (...) */ }
```

to achieve the same for `display: table`.