adjust formatter to include examples and use custom profile

Custom format settings:
- EOL: LF
- don't adjust line wrapping when already wrapped
- use tabs and set indendation to 4

pom.xml

@@ -31,6 +31,15 @@
           <groupId>net.revelc.code.formatter</groupId>
           <artifactId>formatter-maven-plugin</artifactId>
           <version>2.11.0</version>
+          <configuration>
+            <configFile>${project.build.sourceDirectory}/../resources/eclipse-formatter-config.xml</configFile>
+            <lineEnding>LF</lineEnding>
+            <directories>
+              <directory>${project.build.sourceDirectory}</directory>
+              <directory>${project.build.testSourceDirectory}</directory>
+              <directory>${project.build.sourceDirectory}/../../../examples</directory>
+            </directories>
+          </configuration>
           <executions>
             <execution>
               <goals>

src/main/resources/eclipse-formatter-config.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<profiles version="15">
+  <profile kind="CodeFormatterProfile" name="Custom Project Formatter" version="15">
+    <!-- this setting is needed for join_wrapped_lines to work, see:
+         https://github.com/revelc/formatter-maven-plugin/issues/289#issuecomment-475023352 -->
+    <setting id="org.eclipse.jdt.core.formatter.alignment_for_enum_constants" value="16"/>
+    <setting id="org.eclipse.jdt.core.formatter.join_wrapped_lines" value="false"/>
+    <setting id="org.eclipse.jdt.core.formatter.tabulation.char" value="tab"/>
+    <setting id="org.eclipse.jdt.core.formatter.tabulation.size" value="4"/>
+    <setting id="org.eclipse.jdt.core.formatter.indentation.size" value="4"/>
+    <setting id="org.eclipse.jdt.core.formatter.comment.format_javadoc_comments" value="true"/>
+  </profile>
+</profiles>