[Bug Fix] Allow gulp-usemin to work with minified source HTML.

- The matching from some of the regular expression were too greedy and would not work if the source HTML with the build comment was minified.
- This PR turns some of the greedy matching to lazy matching so that this plugin will work with minified HTML as the source.
Merge pull request #15 from CWSpear/lazy

[Bug Fix] Allow gulp-usemin to work with minified source HTML.