Support 2014 spring event missions.
Call Event.preventDefault() in mission dialog instead of "return false" in JavaScript.
Report the problematic property when a type error occurs.
Make the repair ETA as long to be on the safe side.
Cast the current time to long for safety.
Do not set the value type of Mission.eta. JSON loader may type such a value as
int on x86_64 Linux, while long on x64 Windows.
Add a TODO on req_hensei/change.
Add a script to make a release package. Also deleted thirdparty directory,
which is no longer needed.
This way a user can simply unzip a release package working out of the box, or
git clone a repository and selectively update the binary package.
Update the server package selection logic to fit with the new bin directory.
Add bin/ to .gitignore.
Update to use BIN_DIR.