Fix .gitignore

Specific paths needs to be excluded only from the root directory. Otherwise you
couldn't for example create a directory named 'dependencies' somewhere in tests

.gitignore

@@ -1,15 +1,15 @@
 .DS_Store
-android.tests.dependencies
-confluence/target
-dependencies
-dist
-gh-pages
-ideaSDK
-android-studio/sdk
+/android.tests.dependencies
+/confluence/target
+/dependencies
+/dist
+/gh-pages
+/ideaSDK
+/android-studio/sdk
 out
-pluginPublisher/idea*
-pluginPublisher/plugin-verifier.jar
+/pluginPublisher/idea*
+/pluginPublisher/plugin-verifier.jar
 tmp
 workspace.xml
 *.versionsBackup
-idea/testData/debugger/tinyApp/classes*
+/idea/testData/debugger/tinyApp/classes*