Results 3 issues of Ma Lian

Hi, these changes need to work together with https://github.com/CaryLandholt/grunt-hustler/issues/20 to work properly.

For example, if we place a image file to src/images/foo.png or src/styles/images/bar.png, and then we want to reference it in src/index.html or src/styles/styles.less, then bug will appears if we run...

Hi, src/index.html need to be excluded for watch:basic task, because it should be processed by watch:spaHtml task, in which the template:indexDev will handle the content ``` # Run tasks when...