Add a friend search page.(it's just a skelton now.)
Add UserService to search users for a friend-search function.

- Add friend-search page(It is just a skelton now.)
Adjust a behavior of UserService to other Services in case that no object are found from DB.
Merge remote-tracking branch 'origin/master' into make_friends_page
Add a processing of fetching search results in the friend search page.
Use jquery mobile js for developing. (It's indented and easy to see.)
Add "search_with_friendstate" method in UserServiceController.
show friend_state to each row of user list in the friend search page.
Add a show user page. (This page has buttons which can control friend relations)

- re-define friend relation states. (add "be_requested" state)
add FriendService API to control user_relation via ajax.

- add a js function "getUrlVars" that get url params easily
- bug fix
  - users that are not friends yet show in friend/index
Don't get admin users from UserService#search and UserService#search_with_friend_state
Make friend apply notices to show at portal#index.
Add a link for friend search in portal#index and bug fix.

- show alert message by javascript when no users found in friend#search.