add user guide documents about project.
add and modify some sentences according to feedbacks.
removed email infomation
user: Fix an error while accessing setting page
make yobi.Markdown to global object

- typeof yobi.Markdown has changed to object from function
- RegExps are assigned to variables for performance improvement
update timeline partially on issueView (#392)
update timeline periodically(1m) on issueView
auth: Fix authorization works incorrectly.

After visiting a public repository via web browser, authorization have
worked incorrectly because BasicAuthAction set a cookie for an anonymous
user. This patch prevents to set a cookie for an anonymous user.
auth: Remove duplication by using addUserInfoToSession.
rename ambiguous method name, add renderMarkdown()

- renamed .render to .enableMarkdown()
- distinguish static value/function from _renderMarkdown()
  and set it as public method .renderMarkdown()
fix error while adding a project member (#514)
commentwrap:fixed icon of temp file on comment
fix #516. NPE occurs when diff.commitB is null
Merge pull request #241 from laziel/yobi refs/heads/yobi-516
PullRequest: Overview shows also non-outdated line comments
Merge pull request #242 from npcode/yobi refs/heads/feature/show-non-outdated-line-comment-on-pull-request
Merge pull request #225 from npcode/yobi refs/heads/fix/error-while-access-user-setting
Merge pull request #238 from npcode/yobi refs/heads/fix/weird-authorization-after-accessing-repo-via-web-browser
added emails setting
updated isEmailExists to check varified emails