add checkstyle plugin and config file
add new blank line rules to checkstyle settings
Merge branch 'develop' into issue/670-refresh-code-style
new script to check introduced style errors
Merge branch 'develop' into issue/670-refresh-code-style

Conflicts:
	build.gradle
	src/org/wordpress/android/util/StatsRestHelper.java
fix #1227
fix #1221
fix #1222
fix #1223
fix #1224
fix #1225
move WPComLoginActivity to ui.accounts subpackage
Merge pull request #1228 from wordpress-mobile/issue/1227-misc-npe

fix #1227 and other NPEs
fake a holo dialog box using buttonBarStyle - does'nt work on api < 11
remove extra padding
better handling of invalid credentials response
add a password visibilty toggle
change help string for self hosted users
disable edit texts when signin in progress
fix #1231: null check WordPress.currentPost