removed obsolete gitignore entries

Author: bbottema

.gitignore

@@ -29,25 +29,12 @@
 # .idea/mongoSettings.xml
 
 ## File-based project format:
-*.ipr
-*.iws
-
 ## Plugin-specific files:
 
 # IntelliJ
-/out/
-
 # mpeltonen/sbt-idea plugin
-.idea_modules/
-
 # JIRA plugin
-atlassian-ide-plugin.xml
-
 # Crashlytics plugin (for Android Studio and IntelliJ)
-com_crashlytics_export_strings.xml
-crashlytics.properties
-crashlytics-build.properties
-
 /target
 
 # Eclipse