Issue checkstyle#60: added custom header for project

checkstyle-sonar-plugin/config/checkstyle.properties

@@ -1,4 +1,4 @@
 checkstyle.suppressions.file=checkstyle-sonar-plugin/config/suppressions.xml
-checkstyle.header.file=https://raw.githubusercontent.com/checkstyle/checkstyle/master/config/java.header
-checkstyle.regexp.header.file=https://raw.githubusercontent.com/checkstyle/checkstyle/master/config/java_regexp.header
+checkstyle.header.file=checkstyle-sonar-plugin/config/java.header
+checkstyle.regexp.header.file=checkstyle-sonar-plugin/config/java_regexp.header
 checkstyle.importcontrol.file=checkstyle-sonar-plugin/config/import-control.xml

checkstyle-sonar-plugin/config/java.header

@@ -0,0 +1,18 @@
+////////////////////////////////////////////////////////////////////////////////
+// checkstyle: Checks Java source code for adherence to a set of rules.
+// Copyright (C) 2001-2017 the original author or authors.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+////////////////////////////////////////////////////////////////////////////////

checkstyle-sonar-plugin/config/java_regexp.header

@@ -0,0 +1,18 @@
+^/{80}$
+^/{2} checkstyle: Checks Java source code for adherence to a set of rules.$
+^/{2} Copyright \(C\) \d\d\d\d-\d\d\d\d the original author or authors.$
+^/{2}$
+^/{2} This library is free software; you can redistribute it and/or$
+^/{2} modify it under the terms of the GNU Lesser General Public$
+^/{2} License as published by the Free Software Foundation; either$
+^/{2} version \d of the License, or \(at your option\) any later version.$
+^/{2}$
+^/{2} This library is distributed in the hope that it will be useful,$
+^/{2} but WITHOUT ANY WARRANTY; without even the implied warranty of$
+^/{2} MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU$
+^/{2} Lesser General Public License for more details.$
+^/{2}$
+^/{2} You should have received a copy of the GNU Lesser General Public$
+^/{2} License along with this library; if not, write to the Free Software$
+^/{2} Foundation, Inc., \d\d Temple Place, Suite \d\d\d, Boston, MA  \d\d\d\d\d-\d\d\d\d  USA$
+^/{80}$