Add option to allow line breaks before colon.
Add option to allow a line break after colon
Merge branch 'master' into merge-WhitespaceColonChecker

Conflicts:
	src/main/resources/scalastyle_definition.xml
	src/main/resources/scalastyle_messages.properties
Simplified equation in WhitespaceColonChecker
Merge pull request #16 from dwango/support-linebreakAroundColon

WhitespaceColonCheckerにコロン前後の空行を許すオプションを追加