Added experimental/indent rule (#338)

ktlint-ruleset-experimental/pom.xml

@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.github.shyiko.ktlint</groupId>
+        <artifactId>pom</artifactId>
+        <version>0.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>ktlint-ruleset-experimental</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib</artifactId>
+            <version>${kotlin.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.shyiko.ktlint</groupId>
+            <artifactId>ktlint-core</artifactId>
+            <version>0.0.0-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.shyiko.ktlint</groupId>
+            <artifactId>ktlint-test</artifactId>
+            <version>0.0.0-SNAPSHOT</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testng</groupId>
+            <artifactId>testng</artifactId>
+            <version>${testng.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
+        <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
+    </build>
+
+    <profiles>
+        <profile>
+            <id>release</id>
+            <activation>
+                <property>
+                    <name>deploy</name>
+                    <value>maven-central</value>
+                </property>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-source-plugin</artifactId>
+                        <version>3.0.1</version>
+                        <executions>
+                            <execution>
+                                <id>attach-sources</id>
+                                <phase>verify</phase>
+                                <goals>
+                                    <goal>jar-no-fork</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-jar-plugin</artifactId>
+                        <version>3.0.2</version>
+                        <executions>
+                            <execution>
+                                <id>attach-javadocs</id>
+                                <phase>verify</phase>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                                <configuration>
+                                    <classifier>javadoc</classifier>
+                                    <classesDirectory>${basedir}/javadoc</classesDirectory>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+</project>

ktlint-ruleset-experimental/src/main/kotlin/com/github/shyiko/ktlint/ruleset/experimental/ExperimentalRuleSetProvider.kt

@@ -0,0 +1,12 @@
+package com.github.shyiko.ktlint.ruleset.experimental
+
+import com.github.shyiko.ktlint.core.RuleSet
+import com.github.shyiko.ktlint.core.RuleSetProvider
+
+class ExperimentalRuleSetProvider : RuleSetProvider {
+
+    override fun get(): RuleSet = RuleSet(
+        "experimental",
+        IndentationRule()
+    )
+}