Update .gitignore. Sync with HCore .gitignore

.gitignore

@@ -1,5 +1,32 @@
-hibernate-validator/target/*
-hibernate-validator/test-output/*
-hibernate-validator/.*
-hibernate-validator/maven-eclipse.xml
-*~
+# Typically *NIX text editors, by default, append '~' to files on saving to make backups
+*~
+
+# Gradle work directory
+.gradle
+buildSrc/.gradle
+
+# Build output directies
+/target
+*/target
+/build
+*/build
+
+# IntelliJ specific files/directories
+/out
+.idea
+*.ipr
+*.iws
+*.iml
+atlassian-ide-plugin.xml
+
+# Eclipse specific files/directories
+.classpath
+.project
+.settings
+
+# NetBeans specific files/directories
+.nbattrs
+
+# Miscellaneous
+*.log
+.clover