Increase the specificity of PlayFramework rules

The original ignore was far too general and results in eliminating packages
named "db" or "project", for example. These are not that uncommon for package
names. Fixes github#921.

Author: Torben Werner

PlayFramework.gitignore

@@ -1,19 +1,17 @@
 # Ignore Play! working directory #
-bin
-db
-eclipse
-lib
-log
-logs
-modules
-precompiled
-project/project
-project/target
-target
-tmp
+bin/
+/db
+.eclipse
+/lib/
+/logs/
+/modules
+/project/project
+/project/target
+/target
+tmp/
 test-result
 server.pid
 *.iml
 *.eml
-dist
+/dist/
 .cache