logging: Add Logging feature

* Use conf/application-logger.xml as configuration for logging, instead
  of application.conf.
* Log application and play log in logs/application.log, access log in
  logs/access.log and every log in logs/root.log.
* Add a user document about logging.
added JavaDoc and refactoring GitRepository class
doc/access-control: Update some about temp files.

임시 파일 -> 사용자에게 첨부된 파일
doc: Add Common Coding Style Guide.
doc/logging: Add a table for log levels.
doc/logging: Update the description for log format
typeahead: Fix a javascript error.
typeahead: Allow zero as number of items.
javadoc/tag: Add javadoc for TagApp.
AccessControl: refactoring
AccessControl: add javadoc
Attachment: refactoring
attachment: add javadoc
attachment: refactoring bug fix
attachment: refactoring bug fix
add javadoc and remove unused method
HIVE UI CSS (HIVE-188)
apply HIVE UI CSS, override default font-size of bootstrap
issue-label delete link shows only in editable
make filter css and displaying condition to identically. board list CSS has enhanced.