Fix some layout issues on iOS7

Check iOS version by preprocessor

Fix logout button layout on iOS7

Use topLayoutGuide for iOS7 layout.

Fix a issue that shadow of name label is corrupted on logout button.

Disable navigation bar appearances on iOS7

on iOS7, tintColor of separated controller will be default one.

Enable to build on Xcode4.6.

Add keyboard image for iOS7

Revert "Enable to build on Xcode4.6."

This reverts commit a8d0d170ec1c71e63ccb6ba471c09983692d52be.

Enable to build on Xcode4.6 with pre processor

Fix tab input keyboard button mergin on iOS7

Improve animation behavior when back from comment view on iOS7

Improve compatibillity

Add HTBMacro to check running OS version.

Set initial selected button on TagToolbar.

Replace macros to check current running OS.

Fix the issue that text counting is not working on iOS7
Add HTBMacro.h to HatenaBookmarkSDKTests project.
Merge pull request #50 from hatena/ios7

iOS7 Compat