Fixed #270
add milestone progress to home(#319), issue list

- recent milestone progress on project home
- selected milestone progress on issue list
- issue count, tab link has enhanced
- trivial styles on milestone view has modified
Merge pull request #323 from laziel/fix-minorcss-130711

add milestone progress to home(#319), issue list
Fixed Typo
Added javadoc
ProjectUser: minor refactoring
Merge pull request #321 from keesun/feature/enroll

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