refine mikibook and config module
Search results are now shown in QWebView. Manually remove the .indexdir in
your notebookPath and restart mikidown to re-index.
Click search result to open note
Move functions from mikiwindow.py to mikiview.py. Add more tests.
fix multi notebooks support
Beautify search results, close #16 for now.
Use 'Ctrl + [1..9]' to switch notes, close #17.