added standard .gitignore for Scala projects

Author: pnerg

.gitignore

@@ -0,0 +1,26 @@
+*.class
+*.log
+
+# sbt specific
+.cache
+.cache-main
+.cache-tests
+.history
+.lib/
+dist/*
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+
+# Ignore Eclipse files
+.project
+.classpath
+.prefs
+.settings
+
+# Scala-IDE specific
+.scala_dependencies
+.worksheet
+/bin/