fix #239: Switching to a blog without comment clears comment list
remove debug logging
Fix for #253
Use Gradle 1.8, build tools 18.1.1 and SDK target 19.

Should make it a lot easier for new contributors to add the project to the latest android studio.
Remove uses-sdk tag from manifest file. Not needed since we've switched to gradle.
fix #251: Remove post preview after switching from a blog to an empty blog
fix #257: URLEncode username and password in ThemePreviewFragment
Merge pull request #260 from wordpress-mobile/issue-257

fix #257: URLEncode username and password in ThemePreviewFragment
Merge pull request #255 from wordpress-mobile/issue-239

Fix #239: Switching to a blog without comment clears comment list
Merge pull request #259 from wordpress-mobile/issue-251

fix #251: Remove post preview after switching from a blog to an empty blog
Added default parameter to getMapInt() and getMapLong()
Use the passed in Blog object to getRecentPostsTask instead of WordPress.currentBlog, so we don't save posts for the wrong blog if the blog is switched during the network call. Fixes #246.

Also removed an unused variable and method in PostsListFragment.
Adding an xxxhdpi app icon. Fixes #254.
Merge pull request #264 from wordpress-mobile/issue-246-fix

Use the passed in Blog object to getRecentPostsTask instead of WordPress...
Merge pull request #256 from wordpress-mobile/issue-253

Fix for #253
Merge branch 'release/2.5.1' into develop

Conflicts:
	AndroidManifest.xml
	build.gradle
	src/org/wordpress/android/GCMIntentService.java
	src/org/wordpress/android/WordPress.java
	src/org/wordpress/android/WordPressDB.java
	src/org/wordpress/android/ui/OnRearrangeListener.java
	src/org/wordpress/android/ui/comments/CommentsListFragment.java
	src/org/wordpress/android/ui/notifications/NotificationsActivity.java
	src/org/wordpress/android/ui/notifications/NotificationsListFragment.java
	src/org/wordpress/android/ui/posts/EditPostActivity.java
	src/org/wordpress/android/ui/posts/PostsListFragment.java
	src/org/wordpress/android/ui/prefs/PreferencesActivity.java
	src/org/wordpress/android/ui/stats/WPComLoginActivity.java
	src/org/wordpress/android/util/PostUploadService.java
	src/org/wordpress/android/util/StringUtils.java