Better display of name connexions in the main window https://github.com/jeromelebel/MongoHub-Mac/issues/72

Conflicts:
	README.markdown
spelling mistakes

Conflicts:
	README.markdown
Add a dock menu (with all the connections)
Reopen the main window when coming back to the application (if closed) https://github.com/jeromelebel/MongoHub-Mac/issues/76
open the main window when no other window is opened
open the main window when clicking on the dock icon
can use the return key to start a search in the find tab https://github.com/jeromelebel/MongoHub-Mac/issues/100