change english font, modify issue list

- set english font to Lato using google webfonts
- link to list of issues assigned to me, created by me has added
- count issues on issue list tab has changed
Merge branch 'master' of https://github.com/nforge/hive into fix-minorcss-130709
issue list style modified

- remove author avatar image
- smaller height of .issue-item
Merge pull request #313 from laziel/fix-minorcss-130709

스타일 수정, 이슈 목록 기능 강화