diff --git a/extras/rhubarb-for-spine/.gitignore b/extras/rhubarb-for-spine/.gitignore
index 2753810..2f451d7 100644
--- a/extras/rhubarb-for-spine/.gitignore
+++ b/extras/rhubarb-for-spine/.gitignore
@@ -1,14 +1,8 @@
-# User-specific files:
-/.idea/**/workspace.xml
-/.idea/**/tasks.xml
-/.idea/dictionaries/
+# Directory is generated when importing Gradle project
+/.idea/
 
-# Gradle:
+*.iml
 /.gradle/
-/.idea/**/gradle.xml
-/.idea/**/libraries/
-/.idea/**/*.iml
-
 /build/
 /out/
 /tmp/
diff --git a/extras/rhubarb-for-spine/.idea/codeStyleSettings.xml b/extras/rhubarb-for-spine/.idea/codeStyleSettings.xml
deleted file mode 100644
index 5555dd2..0000000
--- a/extras/rhubarb-for-spine/.idea/codeStyleSettings.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectCodeStyleSettingsManager">
-    <option name="PER_PROJECT_SETTINGS">
-      <value />
-    </option>
-    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/extras/rhubarb-for-spine/.idea/compiler.xml b/extras/rhubarb-for-spine/.idea/compiler.xml
deleted file mode 100644
index 34ed3d3..0000000
--- a/extras/rhubarb-for-spine/.idea/compiler.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="CompilerConfiguration">
-    <bytecodeTargetLevel>
-      <module name="rhubarb-for-spine_main" target="1.8" />
-      <module name="rhubarb-for-spine_test" target="1.8" />
-    </bytecodeTargetLevel>
-  </component>
-</project>
\ No newline at end of file
diff --git a/extras/rhubarb-for-spine/.idea/kotlinc.xml b/extras/rhubarb-for-spine/.idea/kotlinc.xml
deleted file mode 100644
index 5806fb3..0000000
--- a/extras/rhubarb-for-spine/.idea/kotlinc.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="Kotlin2JsCompilerArguments">
-    <option name="sourceMapEmbedSources" />
-    <option name="sourceMapPrefix" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/extras/rhubarb-for-spine/.idea/misc.xml b/extras/rhubarb-for-spine/.idea/misc.xml
deleted file mode 100644
index e208459..0000000
--- a/extras/rhubarb-for-spine/.idea/misc.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/out" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/extras/rhubarb-for-spine/.idea/modules.xml b/extras/rhubarb-for-spine/.idea/modules.xml
deleted file mode 100644
index 58be9c9..0000000
--- a/extras/rhubarb-for-spine/.idea/modules.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/modules/rhubarb-for-spine.iml" filepath="$PROJECT_DIR$/.idea/modules/rhubarb-for-spine.iml" />
-      <module fileurl="file://$PROJECT_DIR$/.idea/modules/rhubarb-for-spine_main.iml" filepath="$PROJECT_DIR$/.idea/modules/rhubarb-for-spine_main.iml" group="rhubarb-for-spine" />
-      <module fileurl="file://$PROJECT_DIR$/.idea/modules/rhubarb-for-spine_test.iml" filepath="$PROJECT_DIR$/.idea/modules/rhubarb-for-spine_test.iml" group="rhubarb-for-spine" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/extras/rhubarb-for-spine/.idea/vcs.xml b/extras/rhubarb-for-spine/.idea/vcs.xml
deleted file mode 100644
index b2bdec2..0000000
--- a/extras/rhubarb-for-spine/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
-  </component>
-</project>
\ No newline at end of file