fix for misaligned subscribe icon
add border to borderless text entry area, fixes #201
realign topic legend; fixes #202
Merge pull request #200 from JonathanReeve/master

Miscellaneous fixes:

- Misaligned bbPress forum subscribe icon - Fixes #199
- Add border to bbPress forum editor - Fixes #201
- <legend> CSS alignment - Fixes #202

Props @JonathanReeve.