Toggle module state (which shows only modules and signatures) on Alt+a.

Fix #58.
Improve .gitignore, add .merlin.
Merge pull request #63 from Drup/misc

Improve .gitignore, add .merlin.
Merge pull request #62 from Drup/module-mode

Toggle module state (which shows only modules and signatures) on Alt+a.
Update for 4.02.
Update new ocp-browser for 4.02.
Fix 4.02 warnings
Improvements for 4.02: handle module aliases, get more positions