Fix some recent cocoapods issues

[sungjin-woo]

Recently Cocoapods must assign target on Podfile since version 1.0.0. And link_with are removed.

• [https://github.com/CocoaPods/CocoaPods/releases/tag/1.0.0]

If you don't, you can see the following error message.

Analyzing dependencies
[!] The dependency `UIAlertView+Blocks (>= 0.8)` is not used in any concrete target.
The dependency `UIActionSheet+Blocks (>= 0.8)` is not used in any concrete target.
The dependency `UIAlertController+Blocks (>= 0.8)` is not used in any concrete target.

Avoiding that error, I add some spec on Podfile.

• Assign workspace name
• Assign project path
• Add target specific

And as a result, the project.pbxproj file in xcodeproj was changed.