Rearrange domain files/diretories

Each level of directory now corresponds to a domain part, instead of
having some TLDs represented as top-level directories with dots in them.

CONTRIBUTING.md

@@ -3,26 +3,26 @@
 #### Data Contributions
 
 * All of the school data is stored in a simple filesystem data structure under `lib/domains`.
-* Every directory name in here is a [TLD](http://en.wikipedia.org/wiki/Top-level_domain) (Top Level Domain) e.g. `edu`.
-* Every file in these directories is named after the school's [SLD](http://en.wikipedia.org/wiki/Second-level_domain) (Second Level Domain) e.g `stanford`.
-* The contents of that file are simply the school name e.g. `Stanford University`.
-* The [working example for Stanford University](https://github.com/leereilly/swot/blob/master/lib/domains/edu/stanford) :eyes:
+* The directories are nested to match domain parts, starting with the [TLD](http://en.wikipedia.org/wiki/Top-level_domain) (Top Level Domain), then [SLDs](http://en.wikipedia.org/wiki/Second-level_domain) (Second Level Domains) beneath them, etc.
+* There's a text file named after the school's domain, nested below the appropriate directory, e.g. `strath.ac.uk` would be listed as `lib/domains/uk/ac/strath.txt`.
+* The contents of that file are simply the school name, e.g. `University of Strathclyde`.
+* The [working example for University of Strathclyde](https://github.com/leereilly/swot/blob/master/lib/domains/uk/ac/strath.txt) :eyes:
 * Here's what the data structure looks like:
 
 ```
 [-] lib
     [-] domains
-        [-] ac.uk
-            [+] strath
         [-] edu
             [+] harvard
             [+] stanford
-
+        [-] uk
+            [-] ac
+                [+] strath
 ```
 
 ##### Adding a School
 
-Let's say you want to add the [University of Strathclyde](http://www.strath.ac.uk/). We know the TLD is `ac.uk` and the SLD is `strath`. We'd simply create a file at `lib/domains/ac.uk/strath` containing the text `University of Strathcylde`. You can safely ignores subdomain like `www`, `cis`, whatever. You can see the actual file [here](https://github.com/leereilly/swot/blob/master/lib/domains/ac.uk/strath).
+Let's say you want to add the [Stanford University](http://www.stanford.edu/). We'd simply create a file at `lib/domains/edu/stanford.txt` containing the text `Stanford University`. You can safely ignores subdomain like `www`, `cis`, whatever. You can see the actual file [here](https://github.com/leereilly/swot/blob/master/lib/domains/edu/stanford.txt).
 
 #### Updating a School Name