Add database diagram, code generator, index fragmentation analysis and get partition table informations

new features:

1. database diagram;
2. use "MiniProfiler" to trace sql performance;
3. code generator: generate model class by table or view;
4. generate "Insert", "Update" and "Delete" procedure script for table;
5. index fragmentation analysis;
6. optimize database;
7. get partition table informations;
8. use "CodeMirror" to highlight sql on web page.