Bold checkbox and radio bold content not spaced correctly.

[nicholaschuayunzhi]

Input

- ( ) test1
- ( ) test2
- [ ] test3
- ( ) **test1**
- [ ] **test2**

Output

Whitespace is not pre-pended to the text when parsed into html.

[damithc]

This problem is not limited to here. There is a wider problem is leading spaces getting stripped out when applying formatting (e.g. some text %%some text%%, although it doesn't happen at every place.

[acjh]

Issue mentioned: #90

Looks like the same problem; can't be sure if related.