The biggest diffs are happening in docs, so you can gloss over that. However, take a look at the diffs by clicking Files Changed and scrolling down to the files stored in the less directory. Then click on the less files and you can see what changed. For example, wells.less now has a .wells-large and a .wells-small. There's also a new badges.less file.
The easiest way to upgrade is by dragging the new .less files over to our less directory and removing our former.less files. I believe this is the easiest solution because you have been putting all your overrides in styles.less.
We need to upgrade from bootstrap 2.0.1 to 2.0.2. Take a look at the diff's here. https://github.com/twitter/bootstrap/compare/7ec09d0db9b1117d708682a08efaa55045e6926e...master
The biggest diffs are happening in docs, so you can gloss over that. However, take a look at the diffs by clicking Files Changed and scrolling down to the files stored in the less directory. Then click on the less files and you can see what changed. For example, wells.less now has a .wells-large and a .wells-small. There's also a new badges.less file.
The easiest way to upgrade is by dragging the new .less files over to our less directory and removing our former.less files. I believe this is the easiest solution because you have been putting all your overrides in styles.less.