Add Feature: Jump to Location

[j796160836]

Add Feature

• Jump to Location (Press Cmd + G to activate)

Bug Fix

• Apply default location when GPS failed

[wangpy]

Question:

1. What can the users do with dropped pins?
2. In what situations do we need to manually update locations?

Style Suggestions:

1. Change "JumpLocationViewController" to "JumpToLocationViewController"
2. Change "JumpLocationDelegate" to "JumpToLocationViewControllerDelegate" or "JumpToLocationReceiver"
3. Add a "delegate" or "receiver" property to JumpToLocationViewController to make it call the methods to receiver directly, and move the code in AppDelegate to JumpToLocationViewController as much as possible.
4. change the name all button click handler method to "onXxxxxClicked"