Generate an enhanced manifest for OSGi support (#394)

* Generate an enhanced manifest for OSGi support

Fixes #390

* Move bnd-maven-plugin version to parent pom
diff --git a/javaparser-core/bnd.bnd b/javaparser-core/bnd.bnd
new file mode 100644
index 0000000..23ffe85
--- /dev/null
+++ b/javaparser-core/bnd.bnd
@@ -0,0 +1,17 @@
+# Make the Bundle-SymbolicName fully qualified, not just the artifact id
+Bundle-SymbolicName: com.github.javaparser.javaparser-core
+
+# Export all packages except impl
+-exportcontents: \
+    com.github.javaparser, \
+    com.github.javaparser.ast, \
+    com.github.javaparser.ast.body, \
+    com.github.javaparser.ast.comments, \
+    com.github.javaparser.ast.expr, \
+    com.github.javaparser.ast.stmt, \
+    com.github.javaparser.ast.type, \
+    com.github.javaparser.ast.visitor
+
+# Don't use the project's version for the packages
+# We prefer not setting a version as we don't follow OSGi version semantics
+-nodefaultversion: true