Combine wrap-normal and break-normal, rename wrap-break to break-words

[adamwathan]

In #571 we added a .break-all utility and renamed .break-words to .wrap-break because we decided it made sense to have .wrap-normal and .break-normal as separate "reset" utilities, since they target different properties.

In practice I think this is wasting an opportunity to make things easier for the end user, so this PR tweaks things so that wrap-break is back to .break-words, and .break-normal now resets both word-break and overflow-wrap.

In my testing there are no situations where it ever makes sense to add break-words and break-all to the same element, because break-all always takes precedence, so we might as well treat these like they are manipulating the same property and provide a little normalization for the end user.

Here's a more readable diff:

- .wrap-normal {
-   overflow-wrap: normal;
- }
- .wrap-break {
-   overflow-wrap: break-word;
- }
- .break-normal {
-   word-break: normal;
- }
- .break-all {
-   word-break: break-all;
- }
+ .break-normal {
+   overflow-wrap: normal;
+   word-break: normal;
+ }
+ .break-words {
+   overflow-wrap: break-word;
+ }
+ .break-all {
+   word-break: break-all;
+ }